Pharmaceutical composition for modified release

ABSTRACT

A pharmaceutical composition for modified release comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, and a carrier for a sustained release pharmaceutical composition, wherein a dissolution rate of the drug from the composition is less than 85% after 30 minutes from the beginning of a dissolution test, is disclosed.

TECHNICAL FIELD

The present invention relates to a pharmaceutical composition for modified release capable of reducing food effects observed in conventional tablets, by combining an active ingredient with one or more excipients and controlling a releasing rate of the active ingredient.

More particularly, the present invention relates to a pharmaceutical composition for modified release comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, and a carrier for a sustained release pharmaceutical composition, in which the changes of an area under a blood drug concentration versus time curve (AUC) and a maximum blood drug concentration (Cmax) by the intake of food are reduced by controlling a releasing rate of the active ingredient.

BACKGROUND ART

(R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide has been created by Astellas Pharma Inc., and it has been reported that this compound has not only both an activity of promoting insulin secretion and an activity of enhancing insulin sensitivity, but also an antiobestic activity and an antihyperlipemic activity based on an activity of selectively stimulating a β3 receptor, and is useful in treating diabetes (see, for example, patent literature 1).

Further, it has been reported that the compound can be used as a therapeutic agent for overactive bladder, such as overactive bladder accompanied by prostatic hyperplasia, or overactive bladder accompanied by urinary urgency, urinary incontinence, and urinary frequency (see, for example, patent literature 2).

A clinical trial of (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide in, the form of conventional formulations revealed that pharmacokinetic data unexpectedly varied according to the presence or absence of the intake of food. For example, the rate of decrease of Cmax in a fed state was 67%, and the rate of decrease of AUC in the fed state was 47%, in comparison with those in a fasted state. In this case, Cmax in the fasted state was three times higher than that in the fed state. These problems are considered to be raised by, for example, the changes in pharmacokinetics caused by food, and therefore, the development of a formulation capable of avoiding the effects by food intake is desired.

As a technique of preparing a formulation for modified release, a hydrogel sustained release tablet containing an additive which ensures penetration of water into the tablet, and a hydrogel-forming polymer is disclosed (see, for example, patent literature 3).

However, patent literature 3 does not refer to (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide, and further improvements are needed to produce a pharmaceutical composition.

CITATION LIST Patent Literature

-   [patent literature 1] International Publication No. WO 99/20607     (Example 41) -   [patent literature 2] International Publication No. WO 2004/041276 -   [patent literature 3] International Publication No. WO 94/06414

SUMMARY OF INVENTION Technical Problem

An object of the present invention is to provide a pharmaceutical composition for modified release comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, in which the pharmaceutical composition has efficacy the same as or higher than those of conventional formulations and has no limitations on food intake.

Solution to Problem

The elimination half-life (T_(1/2)) of (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide is long (approximately 18 to 24 hours), and thus, a formulation thereof for modified release is not necessarily needed to maintain its blood level. Taking into consideration the results of the clinical trial described above, the present inventors conducted intensive studies to design the formulation by paying attention to the control of a release rate of the drug from a formulation to the extent that the release is not affected by food intake or the like, rather than the addition of release control.

On the basis of blood concentration profiles (in a fasted state/after the intake of food) after administration of a conventional formulation (immediate release formulation), the absorption rate of the drug in a fed state was calculated by a deconvolution method to predict continuous absorption for about 4 hours. The present inventors considered from this result that a formulation capable of continuous drug release for 4 hours or more would be able to reduce the effects by food, because the drug release from the formulation would become the rate-limiting step for absorption.

The present inventors carried out a clinical trial in human using three types of formulations in which the release rate of the drug was controlled, and found that all formulations could reduce the effects by food, to complete the present invention.

It is generally known that the retention time in the stomach and the release rate of formulations for modified release vary according to the presence or absence of food intake, and as a result, there is a possibility that blood concentration profiles is changed. However, surprisingly, when using this formulation, the change of the blood concentration profiles was small in the presence or absence of food intake.

The present invention is characterized by providing a pharmaceutical composition for modified release which is not affected by the effects of food intake and exhibits a decreased change in AUC or Cmax, by controlling the releasing rate of the active ingredient.

The present invention provides:

[1] a pharmaceutical composition for modified release comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, and a carrier for a sustained release pharmaceutical composition, wherein a dissolution rate of the drug from the composition is less than 85% after 30 minutes from the beginning of a dissolution test, [2] the pharmaceutical composition for modified release of [1], wherein a dissolution rate is 75% or less after 1.5 hours from the beginning of the dissolution test, [3] the pharmaceutical composition for modified release of [1], wherein the dissolution rate is 75% or less after 1.5 hours from the beginning the dissolution test, and a dissolution rate is 75% to 100% after 7 hours from the beginning of the dissolution test, [4] the pharmaceutical composition for modified release of any one of [1] to [3], which is selected from the group consisting of a sustained release hydrogel-forming formulation, a multi-layered formulation consisting of a drug core and a release-controlling layer which are geometrically arranged, a gel formulation in which a plurality of gums is combined, an osmotic pump type formulation, a formulation utilizing a swelling polymer, a matrix formulation utilizing a water-soluble polymer, a modified release formulation with a coating membrane, and a matrix formulation utilizing an insoluble polymer, [5] a method of reducing an effect of food intake, comprising the step of administering a pharmaceutical composition comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, and a carrier for a sustained release pharmaceutical composition, wherein a dissolution rate of the drug from the composition is less than 85% after 30 minutes from the beginning of a dissolution test, [6] the method of reducing an effect of food intake of [5], wherein a dissolution rate is 75% or less after 1.5 hours from the beginning of the dissolution test, [7] the method of reducing an effect of food intake of [5], wherein the dissolution rate is 75% or less after 1.5 hours from the beginning the dissolution test, and a dissolution rate is 75% to 100% after 7 hours from the beginning of the dissolution test, and [8] the method of reducing an effect of food intake of any one of [5] to [7], wherein the pharmaceutical composition is selected from the group consisting of a sustained release hydrogel-forming formulation, a multi-layered formulation consisting of a drug core and a release-controlling layer which are geometrically arranged, a gel formulation in which a plurality of gums is combined, an osmotic pump type formulation, a formulation utilizing a swelling polymer, a matrix formulation utilizing a water-soluble polymer, a modified release formulation with a coating membrane, and a matrix formulation utilizing an insoluble polymer.

As formulation techniques for reducing or avoiding the changes in pharmacokinetics such as AUC or Cmax accompanied by food intake, a formulation technique concerning a sustained-release pharmaceutical composition containing tamsulosin hydrochloride is disclosed (see Japanese Unexamined Patent Publication (Kokai) No. 2005-162736 and Japanese Unexamined Patent Publication (Kokai) No. 2005-162737). This formulation technique is limited to tamsulosin, and applied to a formulation containing the drug at a low dose (0.4 mg per unit formulation). This formulation enables to control the release of tamsulosin therefrom by being mainly composed of a sustained-release base. By contrast, the pharmaceutical composition contains the drug at a high dose (i.e., high content per unit formulation), and it is considered difficult to control the release rate of the drug from a formulation containing the sustained-release base at a low content, and therefore, the present invention is technically quite different from the formulation disclosed in these references.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a pharmaceutical composition for modified release which has no limitations on food intake and which is capable of reducing the changes in Cmax and AUC can be provided.

With respect to a conventional formulation, the rate of decrease of Cmax in a fed state was 67% in comparison with that in a fasted state. By contrast, with respect to the pharmaceutical composition for modified release of the present invention, the rate of decrease of Cmax in a fed state was 4% or 10% in comparison with that in a fasted state, and this result showed that reduction of Cmax caused by food intake could be significantly alleviated by forming its formulation into the pharmaceutical formulation for modified release.

With respect to a conventional formulation, the rate of decrease of AUC in a fed state was 47% in comparison with that in a fasted state. By contrast, with respect to the pharmaceutical composition for modified release of the present invention, the rate of decrease of AUC in a fed state was 10% or −4% in comparison with that in a fasted state, and this result showed that reduction of AUC caused by food intake could be significantly alleviated by forming its formulation into the pharmaceutical formulation for modified release.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a graph showing the drug release property from each of the formulations prepared in Examples 1A to 1C in Experimental Example 1.

FIG. 2 is a graph showing the drug release property from each of the formulations prepared in Examples 2A to 2D in Experimental Example 2.

FIG. 3 is a graph showing the drug release property from the formulation prepared in Example 3 in Experimental Example 3.

FIG. 4 is a graph showing the drug release property from the formulation prepared in Example 4 in Experimental Example 4.

FIG. 5 is a graph showing the drug release property from each of the formulations prepared in Examples 5A to 5C in Experimental Example 5.

FIG. 6 is a graph showing the drug release property from each of the formulations prepared in Examples 6A to 6G in Experimental Example 6.

FIG. 7 is a graph showing the drug release property from each of the formulations prepared in Examples 6H to 6N in Experimental Example 6.

FIG. 8 is a graph showing the drug release property from each of the formulations prepared in Examples 7A to 7E in Experimental Example 7.

FIG. 9 is a graph showing the drug release property from each of the formulations prepared in Examples 8A to 8C in Experimental Example 8.

FIG. 10 is a graph showing the drug release property from each of the formulations prepared in Examples 8D to 8G in Experimental Example 8.

FIG. 11 is a graph showing the relation between Cmax and the increase in heart rate from the base line in Experimental Example 9 (a dotted line shows 95% confidence interval).

FIG. 12 is a graph showing blood concentration profiles after the administration of the formulation of Example 1A in a fasted state or after 30 minutes from the intake of food in Experimental Example 10.

FIG. 13 is a graph showing the blood concentration profiles after the administration of the formulation of Example 1B in a fasted state or after 30 minutes from the intake of food in Experimental Example 10.

DESCRIPTION OF EMBODIMENTS

The pharmaceutical composition for modified release of the present invention will be explained hereinafter.

The term “immediate release formulation (conventional formulation)” as used herein means a formulation in which the dissolution rate of the drug from the formulation is 85% or more after 30 minutes from the beginning a dissolution test, which is carried out in accordance with a dissolution test (paddle method) described in the United States Pharmacopoeia under the conditions that 900 mL of an appropriate test fluid (such as a USP buffer, pH 6.8) is used and the paddle rotation speed is 100 rpm. Alternatively, the term means a formulation in which the dissolution rate of the drug from the formulation is 85% or more after 30 minutes from the beginning a dissolution test, which is carried out in accordance with a dissolution test, method 2 described in the Japanese Pharmacopoeia under the conditions that 900 mL of an appropriate test fluid (such as a Mc. Ilvain buffer, pH 6.8) is used and the paddle rotation speed is 50 rpm. Alternatively, the term means a formulation in which the dissolution rate of the drug from the formulation is 85% or more after 30 minutes from the beginning a dissolution test, which is carried out in accordance with a dissolution test, method 2 (paddle method) described in the Japanese Pharmacopoeia under the conditions that 900 mL of a USP phosphate buffer (pH 6.8) is used as a test fluid and the paddle rotation speed is 200 rpm.

The term “pharmaceutical composition for modified release” as used herein means a formulation in which the dissolution rate of the drug from the formulation is less than 85% after 30 minutes from the beginning a dissolution test carried out under the above conditions, and the drug release is controlled to the extent that the effects by food are reduced.

The wording “the effects by food are reduced” as used herein means, for example, a reduction by 10% or more, a reduction by 20% or more in another embodiment, and a reduction by 30% or more in still another embodiment, in comparison with Cmax of a conventional formulation. Alternatively, the term means, for example, a reduction by 10% or more with respect to the rates of decrease of Cmax and AUC in administration after food intake, in comparison with Cmax and AUC in administration in the fasted state, a reduction by 20% or more in another embodiment, and a reduction by 30% or more in still another embodiment.

The rates of decrease of Cmax and AUC are calculated by the following equations:

Rd(Cmax)=[Cmax(FS)−Cmax(FI)]×100/Cmax(FS)

Rd(AUC)=[AUC(FS)−AUC(FI)]×100/AUC(FS)

Rd(Cmax): Rate of decrease of Cmax (%) Cmax(FS): Cmax in administration in the fasted state Cmax(FI): Cmax in administration after food intake Rd(AUC): Rate of decrease of AUC (%) AUC(FS): AUC in administration in the fasted state AUC(FI): AUC in administration after food intake

The term “formulation in which the effects by food are reduced” as used herein means a formulation in which the dissolution rate of the drug from the formulation is less than 85% after 30 minutes from the beginning a dissolution test, which is carried out under the above conditions. In another embodiment, it means a formulation in which the dissolution rate of the drug from the formulation is 75% or less after 1.5 hours from the beginning a dissolution test. In still another embodiment, it means a formulation in which the dissolution rate of the drug from the formulation is 75% or less after 1.5 hours and 75% to 100% after 7 hours from the beginning a dissolution test.

(R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide (hereinafter sometimes referred to as compound A) is represented by the following structural formula.

Compound A may be used in a free form which is not a salt, and may form a salt with an acid in other embodiments. Examples of such a salt include an acid addition salt with a mineral acid such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, or the like; and an acid addition salt with an organic acid such as formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, succinic acid, fumaric acid, maleic acid, lactic acid, malic acid, citric acid, tartaric acid, carbonic acid, picric acid, methanesulfonic acid, ethanesulfonic acid, glutamic acid, or the like.

The dose of compound A may be appropriately selected in accordance with symptom, age, sex, and the like of the patient to be treated. The daily dose of compound A for oral administration to an adult is generally 0.01 to 100 mg/kg, which is administered once or divided into two to four doses per day.

The content of compound A per formulation is, for example, 1% by weight to 70% by weight, 5% by weight to 70% by weight in another embodiment, and 5% by weight to 50% by weight in still another embodiment. The content of compound A per formulation is 1 mg to 500 mg, and 10 mg to 200 mg in another embodiment.

A carrier for a sustained release pharmaceutical composition, which is contained in the pharmaceutical composition for modified release of the present invention together with compound A or a pharmaceutically acceptable salt thereof, is not particularly limited, so long as it is a carrier, a pharmaceutical formulation, or a technique for manufacturing pharmaceutical preparations capable of achieving a specific release rate.

Examples of such a carrier (or a pharmaceutical formulation, or a technique for manufacturing pharmaceutical preparations) which forms the composition or components in the present invention include, for example,

(1) a sustained release hydrogel-forming formulation in which the formulation is almost completely gelled during the retention in the stomach and the small intestine of the upper digestive tract and the drug can be released in the colon of the lower digestive tract, (2) a multi-layered formulation consisting of a drug core and a release-controlling layer which are geometrically arranged, (3) a gel formulation in which a plurality of gums is combined, (4) an osmotic pump type formulation, (5) a formulation utilizing a swelling polymer, (6) a matrix formulation utilizing a water-soluble polymer, (7) a modified release formulation with a coating membrane, (8) a matrix formation utilizing an insoluble polymer, and the like, as described in detail below. The compositions relating to these techniques for manufacturing pharmaceutical preparations, and the techniques per se are incorporated herein by reference.

Hereinafter, each embodiment of the pharmaceutical composition for modified release of the present invention will be explained in detail. Each embodiment described below is mainly explained with reference to cases using compound A as the active ingredient, but instead of compound A, a pharmaceutically acceptable salt thereof may be used.

(1) Sustained Release Hydrogel-Forming Formulation

The sustained release hydrogel-forming formulation contains, as the carrier for a sustained release pharmaceutical composition, an additive that allows water to penetrate into the formulation (designated as a gelling agent, a promoting agent for gelling, and a hydrophilic base, but hereinafter referred to as hydrophilic base), and a polymer which forms a hydrogel (hereinafter referred to as hydrogel-forming polymer).

It is necessary that the hydrogel-forming polymer used in the present invention can control the release rate of the drug, to the extent that the blood concentration profile of the drug is not affected by the presence or absence of food intake.

The molecular weight of the hydrogel-forming polymer is, for example, 100,000 or more, 100,000 to 8,000,000 in another embodiment, 100,000 to 5,000,000 in still another embodiment, and 100,000 to 2,000,000 in still another embodiment. The viscosity of the hydrogel-forming polymer is, for example, 12 mPa·s or more in a 5% aqueous solution at 25° C.; 12 mPa·s or more in a 5% aqueous solution at 25° C., and 40,000 mPa·s or less in a 1% aqueous solution at 25° C. in another embodiment; 400 mPa·s or more in a 2% aqueous solution at 25° C., and 7,500 mPa·s or less in a 1% aqueous solution at 25° C. in still another embodiment; and 400 mPa·s or more in a 2% aqueous solution at 25° C., and 5,500 mPa·s or less in a 1% aqueous solution at 25° C. in still another embodiment.

In the pharmaceutical composition for modified release of the present invention, the release period of time of the drug from the formulation can be arbitrarily controlled by adjusting the viscosity of the polymer which is used as the hydrogel-forming polymer.

The hydrogel-forming polymer used in the present invention is not particularly limited, so long as the release of the drug can be controlled to the extend that the effects of food on compound A may be reduced. Examples of the hydrogel-forming polymer include polyethylene oxide, hypromellose, hydroxypropyl cellulose, carboxymethyl cellulose sodium, hydroxyethyl cellulose, and carboxyvinyl polymers. Examples of the hydrogel-forming polymer in another embodiment include polyethylene oxide, hypromellose, and hydroxypropyl cellulose.

Examples of polyethylene oxide (hereinafter sometimes referred to as PEO) include product names, Polyox WSR-308 [average molecular weight: 8,000,000, viscosity: 10,000-15,000 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR-303 [average molecular weight: 7,000,000, viscosity: 7,500-10,000 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR Coagulant [average molecular weight: 5,000,000, viscosity: 5,500-7,500 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR-301 [average molecular weight: 4,000,000, viscosity: 1,650-5,500 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR-N-60K [average molecular weight: 2,000,000, viscosity: 2,000-4,000 mPa·s (2% aqueous solution at 25° C.)], Polyox WSR-N-12K [average molecular weight: 1,000,000, viscosity: 400-800 mPa·s (2% aqueous solution at 25° C.)], Polyox WSR-1105 [average molecular weight: 900,000, viscosity: 8,800-17,600 mPa·s (5% aqueous solution at 25° C.)], Polyox WSR-205 [average molecular weight: 600,000, viscosity: 4,500-8,800 mPa·s (5% aqueous solution at 25° C.)], Polyox WSR-N-750 [average molecular weight: 300,000, viscosity: 600-1200 mPa·s (5% aqueous solution at 25° C.)], Polyox WSR-N-80 [average molecular weight: 200,000, viscosity: 55-90 mPa·s (5% aqueous solution at 25° C.)], and Polyox WSR-N-10 [average molecular weight: 100,000, viscosity: 12-50 mPa·s (5% aqueous solution at 25° C.)] (DOW).

Examples of hypromellose (hereinafter sometimes referred to as HPMC) include product name Metolose 90SH50000 [viscosity in a 2% aqueous solution at 20° C.: 2,900-3,900 mPa·s], Metolose SB-4 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4 mPa·S), TC-5RW (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 6 mPa·S), TC-5S (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 15 mPa·S), TC-5R (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 6 mPa·S), TC-5M (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4.5 mPa·S), TC-5E (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 3 mPa·S), Metolose 60SH-50 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 50 mPa·s), Metolose 65SH-50 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 50 mPa·s), Metolose 90SH-100 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 100 mPa·s), Metolose 90SH-100SR (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 100 mPa·s), Metolose 65SH-400 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 400 mPa·s), Metolose 90SH-400 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 400 mPa·s), Metolose 65SH-1500 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 1,500 mPa·s), Metolose 60SH-4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 65SH-4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 90SH-4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 90SH-4000SR (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 90SH-15000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 15,000 mPa·s), Metolose 90SH-15000SR (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 15,000 mPa·s), and Metolose 90SH-30000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 30,000 mPa·s).

Examples of hydroxypropyl cellulose (hereinafter sometimes referred to as HPC) include HPC-SSL (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: 2.0-2.9 mPa·S), HPC-SL (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: 3.0-5.9 mPa·S), HPC-L (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: 6.0-10.0 mPa·S), HPC-M (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: 150-400 mPa·S), and HPC-H (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: 1,000-4,000 mPa·S).

Examples of methylcellulose (hereinafter sometimes referred to as MC) include Metolose SM15 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 15 mPa·S), Metolose SM25 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 25 mPa·S), Metolose SM100 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 100 mPa·S), Metolose SM400 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 400 mPa·S), Metolose SM1500 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 1,500 mPa·S), and Metolose SM4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% aqueous solution at 20° C.: approximately 4,000 mPa·S).

Examples of carboxymethyl cellulose sodium (hereinafter sometimes referred to as CMCNa) include product names, Sunrose F-30MC [viscosity: 250-350 mPa·s (1% aqueous solution at 25° C.)], Sunrose F-150MC [average molecular weight: 200,000, viscosity: 1,200-1,800 mPa·s (1% aqueous solution at 25° C.)], Sunrose F-600MC [viscosity: 6,000-8,000 mPa·s (1% aqueous solution at 25° C.)], Sunrose F-1000MC [average molecular weight: 420,000, viscosity: 8,000-12,000 mPa·s (the same)], Sunrose F-1400MC [viscosity: 12,000-15,000 mPa·s (1% aqueous solution at 25° C.)], and Sunrose F-300MC [average molecular weight: 300,000, viscosity: 2,500-3,000 mPa·s (the same)](Nippon Paper Chemicals Co., Ltd.).

Examples of hydroxyethyl cellulose (hereinafter sometimes referred to as HEC) include product names, HEC DAICEL SE850 [average molecular weight: 1,480,000, viscosity: 2,400-3,000 mPa·s (1% aqueous solution at 25° C.)], and HEC DAICEL SE900 [average molecular weight: 1,560,000, viscosity: 4,000-5,000 mPa·s (1% aqueous solution at 25° C.)](Daicel chemical Industries, Ltd.).

Examples of carboxyvinyl polymers include Carbopol 71G (viscosity: 4,000-11,000 mPa·s), Carbopol 971P (viscosity: 4,000-11,000 mPa·s), Carbopol 981 (viscosity: 4,000-10,000 mPa·s), Carbopol 941 (viscosity: 4,000-10,000 mPa·s), Carbopol 934 (viscosity: 30,500-39,400 mPa·s), and Carbopol 934P (viscosity: 29,400-39,400 mPa·s) (B.F. Goodrich Chemical).

These hydrogel-forming polymers may be used alone, or as an appropriate combination of two or more thereof. A combination of different lots may be used.

The content of the hydrogel-forming polymer is not particularly limited, so long as it is an amount to the extent that the blood concentration profile of the drug is not affected by the presence or absence of food intake. The content of the hydrogel-forming polymer is, for example, 1% by weight to 70% by weight with respect to the total weight of the formulation, and 3% by weight to 70% by weight in another embodiment. The content of the hydrogel-forming polymer is 5% by weight to 70% by weight with respect to the total weight of the formulation, 10% by weight to 60% by weight in another embodiment, and 10% by weight to 40% by weight in still another embodiment. The content of the hydrogel-forming polymer is 0.1% by weight to 1,000% by weight with respect to the weight of the drug, 1% by weight to 500% by weight in another embodiment, and 5% by weight to 300% by weight in still another embodiment.

A polymer of which the viscosity (before mixing) is beyond the specific range can be used as an appropriate combination with one or more other polymers, in case that the mixture obtained by mixing these plural polymers has a viscosity (as measured before the use) within the specific range.

In the additive which ensures penetration of water into the pharmaceutical composition of the present invention (hydrophilic base), the amount of water necessary to dissolve 1 g of the hydrophilic base at 20±5° C. is 10 mL or less, 6 mL or less in another embodiment, 5 mL or less in still another embodiment, and 4 mL or less in still another embodiment. When the hydrophilic base has a high solubility to water, the effect that allows water to penetrate into the formulation is high.

Examples of the hydrophilic base include water-soluble polymers, such as polyethylene glycol [PEG: for example, product names PEG 400, PEG 1500, PEG 4000, PEG 6000, and PEG 20000 (NOF Corporation)], polyvinyl pyrrolidone (PVP: for example, product name PVP K30 (BASF), and the like; sugar alcohols, such as D-mannitol, D-sorbitol, xylitol, and the like; saccharides, such as lactose, sucrose, anhydrous maltose, D-fructose, dextran (for example, Dextran 40), glucose, and the like; surfactants, such as polyoxyethylene hydrogenated castor oil [HCO: for example, Cremophor RH40 (BASF), HCO-40, HCO-60 (Nikko Chemicals)], polyoxyethylene polyoxypropylene glycol [for example, Pluronic F68 (ADEKA Corporation and the like)], polyoxyethylene sorbitan higher fatty acid esters [Tween: for example, Tween 80 (Kanto Chemical)], and the like; salts, such as sodium chloride, magnesium chloride, and the like; organic acids, such as citric acid, tartaric acid, and the like; amino acids, such as glycine, β-alanine, lysine hydrochloride, and the like; and aminosaccharides, such as meglumine and the like.

As another embodiment, PEG, PVP, D-mannitol, D-sorbitol, xylitol, lactose, sucrose, anhydrous maltose, D-fructose, dextran, glucose, polyoxyethylene polyoxypropylene glycol, sodium chloride, magnesium chloride, citric acid, tartaric acid, glycine, β-alanine, lysine hydrochloride, or meglumine may be used. As still another embodiment, PEG, PVP, D-mannitol, lactose, sucrose, sodium chloride, polyoxyethylene polyoxypropylene glycol, or the like may be used.

These hydrophilic bases may be used alone, or as an appropriate combination of two or more thereof.

The content of the hydrophilic base is not particularly limited, so long as it is an amount capable of controlling the release of the drug to the extent that the release of the drug is not affected by food. The content of the hydrophilic base is, for example, 5% by weight to 75% by weight, 5% by weight to 70% by weight in another embodiment, and 20% by weight to 60% by weight in still another embodiment.

The sustained release hydrogel-forming formulation, as an embodiment of the pharmaceutical composition for modified release of the present invention, may be prepared as various dosage forms, which include, for example, formulations for oral administration such as tablets, capsules (including microcapsules), granules, and powder, and formulations for parenteral administration such as suppositories (for example, rectal suppositories or vaginal suppositories). These formulations may be safely administered orally or parenterally. Formulations for oral administration such as tablets, capsules, and granules may be selected in another embodiment.

Hereinafter, various pharmaceutical additives which may be used in the sustained release hydrogel-forming formulation, as an embodiment of the pharmaceutical composition for modified release of the present invention, and various methods for preparing the sustained release hydrogel-forming formulation will be explained, but these explanations are not particularly limited to the sustained release hydrogel-forming formulation, and can be applied to formulations other than the sustained release hydrogel-forming formulation.

The pharmaceutical composition for modified release of the present invention may be prepared by mixing the drug, the hydrogel-forming polymers, and the hydrophilic base, and forming the mixture into a predetermined shape. The mixing and forming may be carried out in accordance with conventional methods widely used in the technical field for formulation. A pharmaceutically acceptable carrier may be used in the mixing and/or forming, if desired.

In the preparation of the pharmaceutical composition for modified release of the present invention, further various pharmaceutical additives may be used, if desired. Such pharmaceutical additives are not particularly limited, so long as they are pharmaceutically acceptable. Examples of the pharmaceutical additives include various organic or inorganic carrier substances which are widely used as formulation materials, such as fillers, lubricants, binders, and disintegrating agents. Other formulation additives such as preservatives, antioxidants, stabilizers, film coating agents, coloring agents, and sweeteners may be used, if desired.

Examples of the fillers include lactose, sucrose, D-mannitol, D-sorbitol, starch, gelatinized starch, dextrin, crystalline cellulose, low substituted hydroxypropyl cellulose, carboxymethyl cellulose sodium, gum arabic, dextrin, pullulan, light anhydrous silicic acid, synthetic aluminum silicate, magnesium aluminate metasilicate, and the like.

Examples of the lubricants include magnesium stearate, calcium stearate, talc, colloidal silica, and the like.

Examples of the binders include gelatinized starch, sucrose, gelatin, gum arabic, methylcellulose, carboxymethyl cellulose, carboxymethyl cellulose sodium, crystalline cellulose, sucrose, D-mannitol, trehalose, dextrin, pullulan, hydroxypropyl cellulose, hypromellose, polyvinylpyrrolidone, and the like.

Examples of the disintegrating agents include lactose, sucrose, starch, carboxymethyl cellulose, carboxymethyl cellulose calcium, croscarmellose sodium, carboxymethyl starch sodium, light anhydrous silicic acid, low substituted hydroxypropylcellulose, and the like.

Examples of the preservatives include p-hydroxybenzoate esters, chlorobutanol, benzyl alcohol, phenethyl alcohol, dehydroacetic acid, sorbic acid, and the like.

Examples of the antioxidants include butylated hydroxytoluene (BHT), propyl gallate (PG), butylhydroxyanisol (BHA), ascorbic acid, sodium ascorbate, erythorbic acid, sodium nitrite, sodium bisulfite, sodium pyrosulfite, citric acid, and edetate sodium; BHT, PG, and sodium ascorbate in another embodiment; and BHT in still another embodiment.

Examples of the stabilizers include yellow ferric oxide, red ferric oxide, black iron oxide, and the like.

Examples of the film coating agents include pharmaceutically commonly-used bases, such as water-soluble polymers, plasticizers, and inorganic substances, or a combination thereof.

Examples of the coloring agents include water-soluble edible tar pigments (examples: edible pigments such as food red No. 2, food red No. 3, food yellow No: 4, food yellow No. 5, food blue No. 1, and food blue No. 2), water-insoluble lake pigments (examples: aluminum salts of the above water-soluble edible tar pigments), natural pigments (examples: β-carotene, chlorophyll, and colcothar), and the like.

Examples of the sweeteners include saccharin sodium, dipotassium glycyrrhizinate, aspartame, stevia, and the like.

These carriers or formulation additives may be used alone, or as an appropriate combination of two or more thereof. With respect to the contents thereof, they may be used in appropriate amounts.

Hereinafter, the process of manufacturing the pharmaceutical composition for modified release of the present invention will be explained, the present invention is not limited to the following particular embodiments.

The pharmaceutical composition for modified release of the present invention may be prepared by known methods per se, such as dry granulation, wet granulation, fluidized bed granulation, intermittent granulation, agitation granulation, or the like.

As a method of de-lumping or pulverizing the drug, conventional crushing or pulverizing methods may be applied, for example, using an impact mill (Hosokawa Micron Corporation; Fine Impact Mill), a dry & wet mill (Powrex Corporation: Comil), or a cutting mill granulator (Dalton Corporation; Power Mill).

As a method of pulverizing the hydrophilic base, the hydrogel-forming polymer, or the formulation additives, conventional pulverizing methods may be applied, for example, using an impact mill (Hosokawa Micron Corporation; Fine Impact Mill or Sample Mill) or a jet mill (Horkos Corp; Jet Mill).

As a method of granulating the drug, conventional granulation methods may be used. Examples of such methods include a fluidized bed granulation method, an intermittent granulation method, an agitation granulation method, a high-speed agitation granulation method, a tumbling fluidized bed granulation method, an extrusion granulation method, a pulverization granulation method, a dry granulation method, and the like. In another embodiment, examples thereof include a fluidized bed granulation method, an intermittent granulation method, an agitation granulation method, a high-speed agitation granulation method, a tumbling fluidized bed granulation method, and a dry granulation method, and any method capable of granulating the drug may be used. Examples of a granulator include a fluidized bed granulator (for example, Flow Coater; Freund Corporation, or GPCG; Glatt GmbH), a granulation and coating apparatus equipped with a horizontal rotating disc having a flat powder contact portion [for example, a centrifugal fluidizing granulator (for example, CF granulator; Freund Corporation)], a granulation and coating apparatus having a rotating disk with a flat surface placed at the bottom of a fluidized bed and having an aeration portion (for example, Spiralflow, or Flowcoater with a rotor container; Freund Corporation), and a dry granulator in which material powder is directly compressed, molded, crushed, and sieved (for example, Roller Compactor; Freund Corporation).

In the dry granulation, for example, the drug, the hydrogel-forming polymer, the hydrophilic base, and additives such as a filler may be compression-molded using a dry granulator, and then, may be crushed and sieved to obtain granulated products having a desired size.

In the wet granulation, for example, while the drug, the hydrogel-forming polymer, the hydrophilic base, and additives such as a filler is fluidized, an appropriate amount of water or a liquid containing the hydrophilic base and the binder may be sprayed. The liquid containing the hydrophilic base may be prepared by dissolving or dispersing the essential component in a solvent such as water, ethanol, methanol, or the like. These solvents may be used as an appropriate mixture thereof.

The amount of water used in the granulation is not particularly limited, so long as the binder or formulation additives may be uniformly dissolved and/or suspended (dispersed) in the water. When the hydrophilic base is used in the solid form, the amount of water is not particularly limited, so long as the hydrogel-forming polymer can be granulated.

When the hydrophilic base is used in the liquid form, the amount of water to the hydrogel-forming polymer is generally 10% by weight or less, 8% by weight or less in another embodiment, and 5% by weight or less in still another embodiment. A method of adding water in the granulation is not particularly limited, so long as a nonuniform mixture consisting of untreated powder and aggregates, which are generally powdery, is not generated. Examples thereof include a continuous spray method in which water is continuously added, an intermittent spray method in which a dry step (and a shaking step, if desired) is carried out during the granulation step, and the like.

The addition rate of water in the granulation is not particularly limited, so long as a nonuniform mixture consisting of untreated powder and aggregates, which are generally powdery, is not generated. In the fluidized bed granulation, the addition rate of water to the hydrogel-forming polymer is generally 0.1% by weight/min. to 1% by weight/min., 0.2% by weight/min. to 0.8% by weight/min. in another embodiment, and 0.4% by weight/min. to 0.6% by weight/min. in still another embodiment.

The temperature of the powder in the granulation is not particularly limited, so long as it does not induce thermal denaturation of the hydrogel-forming polymer. The temperature is, for example, 20° C. to the melting point (62° C. to 67° C.) of the hydrogel-forming polymer, 20° C. to 50° C. in another embodiment, 20° C. to 35° C. in still another embodiment, and 25° C. to 30° C. in still another embodiment.

The concentration of the binder liquid as a solid content which may be used in the granulation is, for example, 1% to 20% as a formulation amount. The binder is not particularly limited, so long as it is pharmaceutically acceptable.

The binder may be added in the solid form to a granulator, and then, water may be sprayed as the binder liquid. Alternatively, the binder may be dissolved in water, and then, the resulting binder liquid may be sprayed.

An appropriate spray rate of the binder liquid varies according to a production method to be applied or its production scale. In a 1-kg scale production by the fluidized bed granulation, the spray rate is 2 g/min. to 20 g/min., and 5 g/min. to 15 g/min. in another embodiment.

An appropriate temperature of the product in the granulation is 15° C. to 50° C., and 15° C. to 40° C. in another embodiment.

The resulting granulated products may be, for example, dried or heated.

In the drying step, an apparatus and a method are not particularly limited, so long as the granulated products can be dried. Examples of an apparatus for drying include a fluidized bed granulator (for example, Flow Coater; Freund Corporation, or GPCG; Glatt GmbH), a granulation and coating apparatus equipped with a horizontal rotating disc having a flat powder contact portion [for example, a centrifugal fluidizing granulator (for example, CF granulator; Freund Corporation)], a granulation and coating apparatus having a rotating disk with a flat surface placed at the bottom of a fluidized bed and having an aeration portion (for example, Spiralflow, or Flowcoater with a rotor container; Freund Corporation), and the like. The conditions for drying are not particularly limited, so long as the granulated products may be generally dried in the fluidized bed. The drying of the granulated products will be almost completed, for example, under the conditions in which the dry inlet air temperature is 50° C. and the drying is carried out until the temperature of the granulated products becomes 40° C. and, in another embodiment, under the conditions in which the dry inlet air temperature is 40° C. and the drying is carried out until the temperature of the granulated products becomes 30° C. As the drying method, forced-air drying or drying under reduced pressure may be used.

The granulated products may be sieved.

In the sieving step, an apparatus and a method are not particularly limited, so long as the granulated products can be sieved. Examples of an apparatus for sieving include a screen, a dry & wet mill (Powrex Corporation: Comil), a cutting mill granulator (Dalton Corporation; Power Mill), and the like. The conditions for sieving are not particularly limited, so long as the granulated products may be generally sieved to obtain particles having a desired size.

Examples of tabletting include a direct tabletting method in which the drug, the hydrophilic base, and the hydrogel-forming polymer are mixed with an appropriate additive(s), and the mixture is compression-molded to obtain tablets; a method in which a composition obtained by a wet granulation (the granulation is carried out by spraying a mixture of the drug, the hydrophilic base, the hydrogel-forming polymer, and additives with a binder liquid) or a melting granulation (the granulation is carried out by heating a mixture of the drug, the hydrophilic base, the hydrogel-forming polymer, and an appropriate low-melting substance) is formed into tablets; and the like.

A rotary tabletting machine, a single punch tabletting machine, and the like may be used as a tabletting machine. A method as well as an apparatus is not particularly limited, so long as a compression-molded product (preferably tablets) can be pharmaceutically produced.

After the tabletting, the obtained tablets may be dried. The initial water content of the tablet is, for example, 2% by weight/tablet or less, 1.5% by weight/tablet or less in another embodiment, and 0.9% by weight/tablet or less in still another embodiment.

After the tabletting, the obtained tablets may be film coated using a pan coating machine at an amount of 1% by weight to 5% by weight per tablet.

(2) Multi-Layered Formulation Consisting of Drug Core and Release-Controlling Layer which are Geometrically Arranged

A multilayered formulation, an embodiment of the pharmaceutical composition for modified release according to the present invention, may be a two-layered or three-layered formulation for modified release, characterized by consisting of a drug-containing layer and a release-controlling layer, and consisting of:

a) the first layer (layer 1) which is prepared by compressing a mixture or granules containing 5 to 90 W/W % (preferably 10 to 85 W/W %) of a water-soluble polymer in this layer, and has a property of being swollen by contact with environmental fluids, b) the second layer (layer 2) comprising compound A, a water-soluble polymer, and other filler(s), which is adjacent to the first layer, has a property suitable to compression-molding, and is designed to release the physiologically active substance within a predetermined period of time, and c) the third layer (layer 3) (which may be optionally adjacent to the layer 2) which contains a water-soluble polymer capable of being generally gelled and/or swollen followed by optionally being disintegrated, and has a property of controlling the release of compound A from the layer 2. The “environmental fluids” include, for example, an aqueous solution as used in a dissolution test, as well as body fluids such as blood or gastrointestinal fluids.

Techniques for such a multilayered formulation which may be used in the pharmaceutical composition for modified release according to the present invention are disclosed in, for example, U.S. Pat. No. 4,839,177, U.S. Pat. No. 5,422,123, U.S. Pat. No. 5,780,057, U.S. Pat. No. 6,149,940, Japanese Patent Publication (Kokai) No. 2005-162736, and Japanese Patent Publication (Kokai) No. 2005-162737, the contents of which are incorporated herein by reference. As disclosed in U.S. Pat. No. 4,839,177 and U.S. Pat. No. 5,422,123, the multilayered formulation is characterized in that a release rate of the drug from the pharmaceutical formulation is controlled by sandwiching the layer 2 containing the drug between the layer 1 and the layer 3 in which the drug is not contained or is optionally contained. Further, as disclosed in U.S. Pat. No. 5,780,057 and U.S. Pat. No. 6,149,940, it is known that when the multilayered formulation is brought into contact with body fluids, at least one of the layer 1 and the layer 3 are rapidly swollen followed by the layer 2 is swollen, that is, the volume of the formulation is significantly increased, and as a result, the formulation remains in the stomach for a longer period of time, and almost all of the active substance contained therein is released and absorbed at the upper gastrointestinal tract in a controlled manner.

The layer 1 and the layer 3 may have the same composition and the same functional properties, or may have different compositions and different functional properties. When the layer 1 and the layer 3 have the same composition and functional properties, the amounts and thicknesses of the layers 1 and 3 which sandwich the layer 2 may be changed. At least one of the layers 1 and 3 acts as a barrier for the release of the active substance, that is, it is impermeable enough for compound A contained in the layer 2 not to be released or diffused therefrom. Further, at least one of the layers 1 and 3 can be rapidly swollen, that is, the volume thereof is rapidly increased. The layer 3 may optionally contain the drug so that a drug release which is different from that released from the layer 2 can be supplementally added to the pharmaceutical formulation.

The water-soluble polymers used in the layer 1, the layer 3, and the layer 2 are not particularly limited, so long as they are pharmaceutically acceptable and biocompatible. Such water-soluble polymers may be gradually dissolved and/or gelled in an aqueous liquid, and/or may be gelled rapidly or at a different rate and then optionally disintegrated. Examples of the water-soluble polymers include, for example, hydroxymethyl cellulose, hydroxyethyl cellulose, hypromellose having a molecular weight of 1,000 to 4,000,000, hydroxypropyl cellulose having a molecular weight of 2,000 to 2,000,000, carboxyvinyl polymers, chitosans, mannans, galactomannans, xanthans, carageenans, amylose, alginic acid, salts and derivatives thereof, pectin, acrylates, methacrylates, acrylate/methacrylate copolymers, polyacid anhydrides, polyamino acids, poly(methylvinyl ether/maleic anhydride) polymers, polyvinyl alcohols, glucans, scleroglucans, carboxymethyl cellulose and derivatives thereof, ethyl cellulose, methyl cellulose, or conventional water-soluble cellulose derivatives. Hypromellose having a molecular weight of 3,000 to 2,000,000 is preferable. The content of the water-soluble polymer in the layer 1 or the layer 3 is generally 5 to 90 W/W %, preferably 10 to 85 W/W %, more preferably 20 to 80 W/W %, with respect to the weight of each layer. The content of the water-soluble polymer in the layer 2 is generally 5 to 90 W/W %, preferably 10 to 85 W/W %, to the weight of the layer.

In the process for preparing the layer 1 and the layer 3, a water-soluble filler which promotes the degree of wetness of the layers may be used, to rapidly increase the volume of the multilayerd formulation containing the above water-soluble polymer. The water-soluble filler may be preferably selected from a group of fillers having an extremely rapid disintegrability, such as cross-linked polyvinylpyrrolidone, hydroxypropyl cellulose or hypromellose having a low or medium molecular weight, cross-linked carboxymethyl cellulose sodium, carboxymethyl starch or salts thereof, divinylbenzene/potassium methacrylate copolymers, or the like.

The content of the filler is 1 to 90 W/W % or less, preferably 5 to 50 W/W % of each layer.

If desired, a surfactant (anionic, cationic, or nonionic surfactants) may be further used to improve the degree of wetness. As a result, tablets and environmental fluids may conform with each other more rapidly, and the tablets, particularly the gel-forming layer, may be gelled more rapidly. Examples of the surfactant include, for example, sodium laurylsulfate, sodium ricinolate, sodium tetradecylsulfonate, sodium dioctylsulfosuccinate, cetomagrogol, poloxamer, glycerol monostearate, polysorbate, sorbitan monolaurate, lecithins, or other pharmaceutically acceptable surfactants.

If desired, another substance which modifies hydration may be further used. Such a substance may be selected from, for example, mannitol, lactose, starches derived from various organs, sorbitol, xylitol, microcrystalline cellulose, and/or a diluent capable of generally promoting a penetration of water or an aqueous liquid into a pharmaceutical composition; or a hydrophobic diluent to retard a penetration of water or an aqueous liquid into a pharmaceutical formulation, such as ethyl cellulose, glycerol monostearate, palmitate, or hydrogenated or non-hydrogenated vegetable oils (for example, hydrogenated castor oil, wax, monoglyceride, diglyceride, or triglyceride). It is preferable to select ethyl cellulose or hydrogenated vegetable oils as the hydrophobic diluent.

The content of the hydrophobic diluent in the layer 1 or the layer 3 is generally 1 to 60 W/W %, preferably 5 to 40 W/W %, more preferably 10 to 30 W/W %, with respect to the weight of each layer.

To control the release rate of compound A from the pharmaceutical formulation, microcrystalline or a water-soluble base, such as dextrose, sucrose, fructose, maltose, xylitol, citric acid, lactose, mannitol, or the like, may be used in the layer 2, if desired.

The content of microcrystalline and/or the water-soluble base in the layer 2 is generally 5 to 90 W/W %, preferably 10 to 80 W/W %, more preferably 20 to 70 W/W %, with respect to the weight of the layer.

The multilayered formulation of the present invention may contain, for example, a lubricant, such as magnesium stearate, talc, stearic acid, glycerol monostearate, polyoxyethylene glycol having a molecular weight of 400 to 7,000,000, hydrogenated castor oil, glycerol behenate, monoglyceride, diglyceride, triglyceride, or the like, a fluidizing agent such as colloidal silica or other silica, a binder, a buffer, an absorbing agent, or other pharmaceutically acceptable additives.

The multilayered formulation of the present invention may be manufactured, for example, by mixing powder and/or granules by a known manufacturing technique per se, and forming the mixture into tablets by compression. A two-layered or three-layered pharmaceutical formulation, such as a tablet, may be manufactured by a known method per se. The multilayered formulation of the present invention may be manufactured, for example, by using a rotary press capable of manufacturing multilayered tablets. It is preferable that a tabletting pressure is generally 7 to 50 kN. When the tablets are manufactured on a small scale, a mortar and pestle may be used to prepare powder and/or granules, and then, an oil press tabletting machine may be used to manufacture two-layered or three-layered tablets. The thickness of each layer of the formulation may vary according to the content of the active substance, and is preferably 0.2 to 8 mm, more preferably 1 to 4 mm. In the formulation of the present invention, for example, a coating layer with a macromolecular material may be applied to the pharmaceutical composition. Such a coating may be applied by using an organic or aqueous solution, in accordance with a known method per se.

When the multilayered formulation of the present invention is brought into contact with gastric juices in the gastrointestinal tract and/or liquids, the volume thereof is rapidly increased. This increase in volume may be limited in a single layer or several layers of the formulation. Such a formulation may be in a form of a tablet, small tablets, or a gelatin capsule consisting of small tablets. Further, at least two small tablets may be combined in the same formulation, and may be packed in, for example, a wafer capsule or a gelatin capsule. When the formulation consists of small tablets, each small tablet may have a different composition or the same composition.

(3) Gel Formulation in which a Plurality of Gums is Combined

A gel formulation in which a plurality of gums is combined, an embodiment of the pharmaceutical composition for modified release according to the present invention, is characterized by comprising at least compound A and a gum base. The gum base as used herein means a sustained release filler comprising a homopolysaccharide which can form a crosslinkage with a heteropolysaccharide gum when exposed to the heteropolysaccharide gum and environmental fluids (such as body fluids, an aqueous solution for an in vitro dissolution test, or the like). The sustained release filler may further comprise calcium sulfate and/or a water-soluble base. The gel formulation may further contain a commonly used filler.

Techniques for obtaining the gel formulation in which a plurality of gums is combined, which may be used in the pharmaceutical composition for modified release according to the present invention, are disclosed in, for example, U.S. Pat. No. 4,994,276, U.S. Pat. No. 5,128,143, U.S. Pat. No. 5,135,757, and Japanese Patent No. 2832248. As disclosed therein, it is known that a heterogeneously dispersed filler comprising a combination of a heteropolysaccharide and a homopolysaccharide exhibiting a synergistic effect, such as a combination of two or more polysaccharide gums, has a viscosity higher than that of any single gum, and can cause a rapid hydration, and thus a harder gel is generated more rapidly. The contents of the above patent references are incorporated herein by reference.

The heteropolysaccharide as used herein is defined as a water-soluble polysaccharide containing two or more sugar units. The heteropolysaccharide is not particularly limited, so long as it has a branched-chain or spiral configuration, and has an excellent water absorbing property and a high viscosity improving property. As the heteropolysaccharide, for example, xanthan gum or derivatives thereof (such as deacylated xanthan gum), carboxymethyl ether, or propylene glycol ester are preferable, and xanthan gum having a high molecular weight (>10⁶) is more preferable.

The homopolysaccharide as used herein is not particularly limited, so long as it is a polysaccharide consisting of mannose and galactose, and can form a crosslinkage with a heteropolysaccharide. Locust bean gum having a high ratio of mannose to galactose is more preferable than other galactomannans such as guar or hydroxypropyl guar.

Other naturally-occurring polysaccharide gums may be used in the present invention. Examples of such polysaccharides include, for example, alginic acid derivatives, carrageenan, tragacanth gum, gum arabic, karaya gum, polyethylene glycol esters of these gums, chitin, chitosan, mucopolysaccharide, konjak, starch, substituted starch, starch fragment, dextrin, British gum having a molecular weight of approximately 10,000 Da, dextran, or the like. The starch may be used in an unmodified form, for example, an ungelled starch such as potato, rice, banana, or the like, or a semisynthetic or gelled starch.

As a combination of the heteropolysaccharide and the homopolysaccharide, the combination of xanthan gum and locust bean gum is particularly preferable. The content ratio of the heteropolysaccharide and the homopolysaccharide is not particularly limited, so long as it is an amount effective in enhancing a desired gel strength. Such a ratio (heteropolysaccharide gum: homopolysaccharide gum) is approximately 3:1 to approximately 1:3, preferably approximately 1:1.

The water-soluble cationic crosslinking agent as used herein is not particularly limited, so long as it is a pharmaceutically acceptable monovalent or polyvalent metal cation. As the binder, for example, calcium sulfate or the like may be used.

The water-soluble base as used herein is not particularly limited, so long as it is pharmaceutically acceptable. Examples of the water-soluble base include, for example, dextrose, sucrose, fructose, maltose, xylitol, citric acid, or the like.

The gel formulation in which a plurality of gums is combined of the present invention may be manufactured, for example, in a pharmaceutically acceptable form for oral administration such as a tablet or the like. In an embodiment, (1) a heteropolysaccharide gum, and a homopolysaccharide which can form a crosslinkage with the heteropolysaccharide gum when exposed to environmental fluids are mixed together under the dry condition with a pharmaceutically acceptable water-soluble base in a desired ratio, (2) the resulting mixture is subject to a wet granulation, (3) the granules are dried, (4) the dried granules are pulverized to obtain a sustained release filler having a desired particle size, (5) the resulting sustained release filler is granulated together with compound A, (6) the resulting granules are dried, (7) a conventional filler, such as a lubricant or the like, is added thereto, and (8) the resulting mixture is formed by compression into, for example, tablets. In another embodiment, a mixture of the sustained release filler and compound A may be granulated, together with an a solution of a hydrophobic substance (such as ethyl cellulose or the like) in an amount sufficient to retard the hydration of the filler (i.e., gums) without the destruction thereof, and then a conventional filler such as a lubricant is added thereto, and the resulting mixture is formed by compression into, for example, tablets.

In the wet granulation, predetermined amounts of the heteropolysaccharide gum, the homopolysaccharide gum, the cationic crosslinking agent, and the water-soluble base are homogeneously mixed; and then, a wetting agent, such as water, propylene glycol, glycerol, alcohol, or the like, is added thereto to prepare a wet aggregate; and the resulting wet aggregate is dried, and pulverized using a conventional apparatus to prepare granules having a predetermined particle size.

As the lubricant, for example, stearic acid or the like may be used. The mixing of the hydrophobic substance with the sustained release filler may be carried out, for example, by using a liquid in which the hydrophobic substance is dissolved and/or dispersed in an organic solvent, and further granulating the above-mentioned granules together with the liquid.

Examples of the hydrophobic substance include, for example, a pharmaceutical acceptable hydrophobic cellulose, such as ethyl cellulose or the like.

A combination and a mixing ratio of each component are not particularly limited. In a preferred embodiment, approximately 5 to 60 W/W % of xanthan gum (as the heteropolysaccharide) and locust bean gum (as the homopolysaccharide) (xanthan gum: locust bean gum=approximately 1:1) with respect to the total weight of the pharmaceutical formulation may be contained, and approximately 10 W/W % or less of calcium sulfate (as the water-soluble cationic crosslinking agent) and approximately 30 to 70 W/W % of dextrose (as an inert diluent) may be further contained. To control the release rate, the hydrophobic substance may be added, and, for example, approximately 5 to 10 W/W % of ethyl cellulose may be contained.

(4) Osmotic Pump Type Formulation

Osmotic pump type formulations utilize osmotic pressure to generate a driving force for imbibing fluid into a formulation, by a semipermeable membrane that permits free diffusion of fluid but not a drug or an osmoagent. The osmotic systems are characterized in that the action thereof is pH-independent, and a drug can be sustainedly released at a constant rate for a long time, even as the formulation transits the gastrointestinal tract and encounters environments having different pH values.

Such osmotic pump type formulations are reported in Santus and Baker, “Osmotic drug delivery: a review of the patent literature”, Journal of Controlled Release, 35, p. 1-21, (1995). Further, osmotic pump type formulations are described in U.S. Pat. Nos. 3,845,770, 3,916,899, 3,995,631, 4,008,719, 4,111,202, 4,160,020, 4,327,725, 4,519,801, 4,578,075, 4,681,583, 5,019,397, and 5,156,850, the contents of which are incorporated herein by reference.

In the osmotic pump type formulation of the present invention, a bilayered compressed core consisting of a drug layer containing compound A, and a push layer, is coated with a semipermeable membrane that permits water or outer fluid but not a drug, an osmoagent, an osmopolymer, or the like. The semipermeable membrane is provided with at least one drug delivery orifice for connecting the inside of the formulation with the exterior environment. Therefore, after the osmotic pump type formulation is orally administered, fluid such as water transits the semipermeable membrane, and penetrates into the inside of the formulation. As a result, an osmotic action is generated, and compound A is sustainedly released through the drug delivery orifice(s) at a constant rate for a long time.

The drug layer contains compound A, as a mixture with a pharmaceutically acceptable additive(s).

The push layer contains one or more osmotic active components, but does not contain compound A, as described in detail below. Typical osmotic active component(s) contained in the push layer may be composed of an osmoagent and one or more osmopolymers. The osmopolymer as used herein means a polymer which has relatively a large molecular weight and swells when fluid is imbibed, to release compound A through the drug delivery orifice(s).

The semipermeable membrane used is not particularly limited, so long as it is permeable to the passage of an external fluid, such as water and biological fluids, and substantially impermeable to the passage of compound A, an osmoagent, an osmopolymer, and the like. Such a semipermeable membrane is essentially nonerodible, and insoluble in a living body.

As polymers for forming the semipermeable membrane, for example, semipermeable homopolymers, semipermeable copolymers, and the like may be used. As materials for such polymers, cellulosic polymers, such as cellulose esters, cellulose ethers, cellulose ester-ethers, and the like, may be used. The cellulosic polymers have a degree of substitution (DS) of anhydroglucose units of more than 0 and 3 or less. The degree of substitution (DS) means the average number of hydroxyl groups originally present on the anhydroglucose units that are replaced by a substituting group or converted into another group. The anhydroglucose unit can be partially or completely substituted with groups, such as acyl, alkanol, alkenoyl, aroyl, alkyl, alkoxy, halogen, carboalkyl, alkylcarbamate, alkylcarbonate, alkylsulfonate, alkylsulfamate, semipermeable polymer forming groups, and the like, wherein the organic moieties contain 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms.

As the typical semipermeable compositions, one member, or two or more members selected from the group consisting of cellulose acylate, cellulose diacylate, cellulose triacylate, cellulose acetate, cellulose diacetate, cellulose triacetate, mono-, di-, and tri-cellulose alkanylates, mono-, di-, and tri-alkenylates, mono-, di-, and tri-aroylates, and the like, may be used. Representative polymers include cellulose acetate having a DS of 1.8 to 2.3 and an acetyl content of 32 to 39.9%; cellulose diacetate having a DS of 1 to 2 and an acetyl content of 21 to 35%; cellulose triacetate having a DS of 2 to 3 and an acetyl content of 34 to 44.8%; and the like.

More specific cellulosic polymers include cellulose propionate having a DS of 1.8 and a propionyl content of 38.5%; cellulose acetate propionate having an acetyl content of 1.5 to 7% and an acetyl content of 39 to 42%; cellulose acetate propionate having an acetyl content of 2.5 to 3%, an average propionyl content of 39.2 to 45%, and a hydroxyl content of 2.8 to 5.4%; cellulose acetate butyrate having a DS of 1.8, an acetyl content of 13 to 15%, and a butyryl content of 34 to 39%; cellulose acetate butyrate having an acetyl content of 2 to 29%, a butyryl content of 17 to 53%, and a hydroxyl content of 0.5 to 47%; cellulose triacylates having a DS of 2.6 to 3, such as cellulose trivalerate, cellulose trilamate, cellulose tripalmitate, cellulose trioctanoate, and cellulose tripropionate; cellulose diesters having a DS of 2.2 to 2.6, such as cellulose disuccinate, cellulosedipalmitate, cellulose dioctanoate, cellulose dicaprylate, and the like; mixed cellulose esters, such as cellulose acetate valerate, cellulose acetate succinate, cellulose propionate succinate, cellulose acetate octanoate, cellulose valerate palmitate, cellulose acetate heptanoate, and the like. Semipermeable polymers are disclosed in U.S. Pat. No. 4,077,407, and can be synthesized and obtained by procedures described in Encyclopedia of Polymer Science and Technology, Vol. 3, pp. 325-354 (1964), Interscience Publishers Inc., New York, N.Y. The content of the polymers is not particularly limited, so long as it is an amount permeable to the passage of an external fluid, such as water and biological fluids, and substantially impermeable to the passage of compound A, an osmoagent, an osmopolymer, and the like. The content of the polymers is preferably 6 to 20 W/W %, more preferably 8 to 18 W/W %, with respect to the weight of a dilayered compressed core consisting of a drug layer and a push layer.

Semipermeable polymers for forming the semipermeable membrane further include cellulose acetaldehyde dimethyl acetate; cellulose acetate ethylcarbamate; cellulose acetate methyl carbamate; cellulose dimethylaminoacetate; semipermeable polyurethanes; semipermeable sulfonate polystyrenes; cross-linked selectively semipermeable polymers formed by the coprecipitation of an anion and a cation, as disclosed in U.S. Pat. Nos. 3,173,876, 3,276,586, 3,541,005, 3,541,006, and 3,546,142; semipermeable polymers, as disclosed in U.S. Pat. No. 3,133,132; semipermeable polystyrene derivatives; semipermeable poly (sodium styrenesulfonate); semipermeable poly (vinylbenzyltrimethylammonium chloride); and semipermeable polymers exhibiting a fluid permeability of 10⁻⁵ to 10⁻² (cc mL/cm hr atm), expressed as hydrostatic or osmotic pressure differences per atmosphere across a semipermeable membrane. These polymers are described in U.S. Pat. Nos. 3,845,770, 3,916,899, and 4,160,020, and in Handbook of Common Polymers, Scott and Roff (1971) CRC Press, Cleveland, Ohio.

The semipermeable membrane may contain a flux-regulating agent. The flux-regulating agent means a substance added to assist in regulating the fluid permeability or flux through the semipermeable membrane. The flux-regulating agents include a substance which enhances the flux (hereinafter referred to as flux-enhancing agent) and a substance which decreases the flux (hereinafter referred to as flux-decreasing agent). The flux-enhancing agents are essentially hydrophilic, while the flux-decreasing agents are essentially hydrophobic. The flux-regulating agents include, for example, polyhydric alcohols, polyalkylene glycols, polyalkylenediols, polyesters of alkylen glycols, and the like.

Typical flux-enhancing agents include polyethylene glycols 300, 400, 600, 1500, 4000, 6000 and the like; low molecular weight glycols, such as polypropylene glycol, polybutylene glycol, and polyamylene glycol: polyalkylenediols, such as poly(1,3-propanediol), poly(1,4-butanediol), poly(1,6-hexanediol), and the like; fatty acids, such as 1,3-butylen glycol, 1,4-pentamethylene glycol, 1,4-hexamethylene glycol, and the like; alkylen triols, such as glycerine, 1,2,3-butanetriol, 1,2,4-hexanetriol, 1,3,6-hexanetriol, and the like; esters, such as ethylene glycol dipropionate, ethylene glycol butyrate, butylene glycol dipropionate, glycerol acetate esters, and the like. Preferred flux-enhancing agents include difunctional block-copolymers of propylene glycol, polyoxyalkylene or derivatives thereof, known as pluronics (trademark, BASF).

Typical flux-decreasing agents include phthalates substituted with an alkyl or alkoxy or with both an alkyl and alkoxy group such as diethyl phthalate, dimethoxyethyl phthalate, dimethyl phthalate, and [di(2-ethylhexyl) phthalate], and aryl phthalates such as triphenyl phthalate and butyl benzyl phthalate; insoluble salts such as calcium sulfate, barium sulfate, calcium phosphate, and the like; insoluble oxides such as titanium oxide; polymers in the form of powder, granules, and the like, such as polystyrene, polymethylmethacrylate, polycarbonate, and polysulfone; esters such as citric acid esters esterified with long chain alkyl groups; inert and water impermeable fillers; resins compatible with cellulose based semipermeable membrane forming materials; and the like.

The content of the flux-regulating agent contained in the semipermeable membrane is approximately 0.01 to approximately 20 W/W % or more.

Other substances may be contained in the semipermeable membrane to impart plasticity, flexibility, and elongation properties, to make the membrane less brittle, and to render tear strength. Such substances include phthalate plasticizers such as dibenzyl phthalate, dihexyl phthalate, butyl octyl phthalate, straight chain phthalates having 6 to 11 carbon atoms, di-isononyl phthalte, di-isodecyl phthalate, and the like. Other plasticizers include nonphthalates such as triacetin, dioctylazelate, epoxidized tallate, tri-isoctyl trimellitate, tri-isononyl trimellitate, sucrose acetate isobutyrate, epoxidized soybean oil, and the like.

The content of the plasticizer contained in the semipermeable membrane is approximately 0.01 to 20 W/W % or more.

The push layer is in contacting layered arrangement with the drug layer. The push layer contains an osmopolymer that imbibes an aqueous or biological fluid and swells to push compound A through the exit means of the formulation. The osmopolymer as used herein means a polymer that interacts with water or aqueous biological fluids and swells or expands to a high degree. Preferred osmopolymers are swellable and hydrophilic polymers exhibiting a 2 to 50-fold volume increase. The osmopolymer can be non-crosslinked or crosslinked, but is preferably at least lightly crosslinked in a preferred embodiment, to create an extended polymer network that is too large to exit the formulation. The content of the osmopolymer can be appropriately selected in accordance with various factors such as properties, content, and the like of a drug contained in the drug layer, but is not particularly limited, so long as it is an amount capable of releasing the drug from the drug layer at a desired dissolution rate by swelling. The amount is preferably 30 mg or more, more preferably 50 mg or more. The content is 40 to 80 W/W % with respect to the weight of the push layer.

The osmopolymers include one or more members selected from the group consisting of poly(alkylen oxide) having a number average molecular weight of 1,000,000 to 15,000,000, as represented by polyethylene oxide, and poly(alkali carboxymethylcellulose) having a number average molecular weight of 500,000 to 3,500,000, wherein the alkali is sodium, potassium, or lithium. The osmopolymers further include osmopolymers comprising polymers that form hydrogels, such as Carbopole (registered trademark), acidic carboxypolymers, polymers of acrylic cross-linked with polyallyl sucrose (known as carboxypolymethylene), and carboxyvinyl polymers having a molecular weight of 250,000 to 4,000,000; Cyanamer (registered trademark) polyacrylamides; cross-linked water swellable indenemaleic anhydride polymers; Good-rite (registered trademark) polyacrylic acid having a molecular weight of 80,000 to 200,000; Aqua-Keeps (registered trademark), acrylate polymer polysaccharides composed of condensed glucose units, such as diester cross-linked polygluran; and the like. Polymers that form hydrogels are described in U.S. Pat. Nos. 3,865,108, 4,002,173, and 4,207,893, and in Handbook of Common Polymers, Scott and Roff, Chemical Rubber Co., Cleveland, Ohio.

The osmoagent (sometimes referred to as an osmotic solute or an osmotically effective agent) may be contained in both of the drug layer containing compound A and the push layer, and is not particularly limited, so long as it exhibits an osmotic activity gradient across the semipermeable membrane. Suitable osmagents include a member or two or more members selected from the group consisting of sodium chloride, potassium chloride, lithium chloride, magnesium sulfate, magnesium chloride, potassium sulfate, sodium sulfate, lithium sulfate, potassium acid phosphate, mannitol, glucose, lactose, sorbitol, inorganic salts, organic salts, and carbohydrates. The content of the osmoagent used is 15 to 40 W/W % with respect to the weight of the push layer.

Solvents suitable for manufacturing the formulation components include aqueous or inert organic solvents that do not adversely harm the substances used in the system. Such solvents broadly include one or more members selected from the group consisting of aqueous solvents, alcohols, ketones, esters, ethers, aliphatic hydrocarbons, halogenated solvents, cycloaliphatic solvents, aromatic solvents, heterocyclic solvents, and mixtures thereof. Typical solvents include acetone, diacetone alcohol, methanol, ethanol, isopropyl alcohol, butyl alcohol, methyl acetate, ethyl acetate, isopropyl acetate, n-butyl acetate, methyl isobutyl ketone, methyl propyl ketone, n-hexane, n-heptane, ethylene glycol monoethyl ether, ethylene glycol monoethyl acetate, methylene dichloride, ethylene dichloride, propylene dichloride, carbon tetrachloride, nitroethane, nitropropane, tetrachloroethane, ethyl ether, isopropyl ether, cyclohexane, cyclooctane, benzene, toluene, naphtha, 1,4-dioxane, tetrahydrofuran, diglyme, water, aqueous solvents containing inorganic salts (such as sodium chloride, calcium chloride, and the like), and mixtures thereof (such as acetone and water, acetone and methanol, acetone and ethyl alcohol, methylene dichloride and methanol, and ethylene dichloride and methanol).

The drug layer is formed from a pharmaceutical composition consisting of compound A in an amount pharmacologically effective in treatment or prevention, and a carrier for a sustained release pharmaceutical composition. The carrier for a sustained release pharmaceutical composition may include hydrophilic polymers.

The hydrophilic polymers impart an action of releasing compound A at a constant releasing rate. Suitable hydrophilic polymers include poly(alkylene oxide) having a number average molecular weight of 100,000 to 750,000, such as poly(ethylene oxide), poly(methylene oxide), poly(buthylene oxide, and poly(hexylene oxide); and poly(carboxymethyl cellulose) having a number average molecular weight of 40,000 to 400,000, typically poly(alkali carboxymethyl cellulose), poly(sodium carboxymethyl cellulose), poly(potassium carboxymethyl cellulose), and poly(lithium carboxymethyl cellulose). The drug composition may contain hydroxypropylalkyl cellulose having a number average molecular weight of 9,200 to 125,000, typically hydroxypropylethyl cellulose, hypromellose, hydroxypropylbutyl cellulose, and hydroxypropylpentyl cellulose, to improve delivery properties of the formulation; and polyvinylpyrrolidone having a number average molecular weight of 7,000 to 75,000, to improve flow properties of the formulation. Among these polymers, poly(ethylene oxide) having a number average molecular weight of 100,000 to 300,000 is most preferable. The content of the hydrophilic polymer can be appropriately selected in accordance with various factors such as physicochemical properties, content, and the like of a drug contained, but is 40 to 90 W/W % with respect to the drug layer.

The drug layer may further contain surfactants and disintegrants, if desired. Suitable surfactants are those having an HLB value of approximately 10 to 25, such as polyethylene glycol 400 monostearate, polyoxyethylene-4-sorbitan monolaurate, polyoxyethylene-20-sorbitan monooleate, polyoxyethylene-20-sorbitan monopalmitate, polyoxyethylene-20-monolaurate, polyoxyethylene-40-stearate, sodium oleate, and the like. Disintegrants may be selected from starches, clays, celluloses, algins and gums and crosslinked starches, celluloses and polymers. Representative disintegrants include corn starch, potato starch, croscarmelose, crospovidone, sodium starch glycolate, Veegum HV, methylcellulose, agar, bentonite, carboxymethylcellulose, alginic acid, guar gum, and the like.

Pan coating may be used to prepare the completed formulation, except for the exit orifice for releasing a drug from the surface of the formulation. In the pan coating system, the composition for forming the semipermeable membrane is deposited by spraying the composition onto the surface of the bilayered compressed core formed from the drug layer and the push layer, accompanied by tumbling in a rotating pan. Alternatively, the compressed core may be coated with the semipermeable membrane by well-known techniques in the art. After the coating, the semipermeable membrane may be dried in a forced-air oven or in a temperature and humidity controlled oven to remove the solvent(s) used in the coating from the formulation. Drying conditions may be appropriately selected on the basis of an available equipment, ambient conditions, solvents, a coating agent, a coating thickness, and the like.

The osmotic pump type formulation, an embodiment of the pharmaceutical composition for modified release of the present invention, can be prepared by known conventional methods, such as wet granulation techniques. In the wet granulation, a drug and a carrier for a sustained release pharmaceutical composition are blended using an organic solvent, such as denatured absolute alcohol and the like, as a granulation solution. The remaining components may be dissolved in a portion of the granulation solution such as the above solvent, and a wet mixture separately prepared is gradually added to the drug mixture, accompanied by the continuous mixing in a blender. The granulation solution is added until a wet aggregate is generated, and the wet aggregate are sifted through a screen arranged on an oven tray. The mixture is dried at a temperature of approximately 24 to 35° C. in a forced-air oven for approximately 18 to 24 hours. The dried granules are sized. A lubricant such as magnesium stearate or the like is added to the drug granules, and the whole is put into a milling jar and mixed on a jar mill for approximately 10 minutes. The composition is pressed into a layer, for example, in a Manestye (registered trademark) press or a Korsch LCT press. For a bilayered core, the drug-containing layer is pressed, and a composition for the push layer, prepared in a similar fashion by wet granulation techniques, is pressed against the drug-containing layer. One exit orifice, or two more exit orifices, are drilled in the drug layer end of the formulation. Optional water soluble overcoats, which may be colored (for example, Opadry colored coatings) or clear (for example, Opadry Clear), may be coated on the formulation to provide the completed formulation.

The osmotic pump type formulation, an embodiment of the pharmaceutical composition for modified release of the present invention, has at least one exit orifice. A drug is constantly released from the formulation through the exit orifice(s) by the compressed core. The exit orifice may be provided during the manufacture of the formulation, or during the drug delivery by the formulation in a fluid environment of use. The terms “exit orifice”, “delivery exit”, “drug delivery exit”, and similar terms as used herein include terms selected from the group consisting of pass, opening, orifice, and bore. Further, these expressions include an orifice that is formed from a substance or polymer that erodes, dissolves or is leached from the outer wall.

This substance or polymer may include, for example, erodible poly(glycolic acid) or poly(lactic acid) in the semipermeable membrane; gelatinous filaments; water-removable polyvinyl alcohol); a leachable compound, such as a fluid removable pore-forming substance selected from the group consisting of inorganic and organic salts, oxides, and carbohydrates. The exit(s) are formed by leaching one or two or more members selected from the group consisting of sorbitol, lactose, fructose, glucose, mannose, galactose, talose, sodium chloride, potassium chloride, sodium citrate and mannitol to provide a uniform-release dimensioned pore-exit orifice(s). The exit can have any shape, such as round, rectangle, square, elliptical, and the like, for the uniform release of a drug from the formulation. The formulation can be constructed with one or two or more exits in spaced-apart relation or on one or more surfaces of the formulation. The pore size of the exit is not particularly limited, so long as it can cooperate with the compressed core to control the release of the drug, but is preferably 0.3 to 0.6 mm. Drilling, including mechanical and laser drilling, through the semipermeable membrane can be used to form the exit orifice. Such exits and equipments for forming such exits are disclosed in U.S. Pat. No. 3,916,899, by Theeuwes and Higuchi and in U.S. Pat. No. 4,088,864, by Theeuwes, et al., each of which is incorporated herein by reference.

(5) Formulation Utilizing Swelling Polymer

The formulation utilizing a swelling polymer, as an embodiment of the pharmaceutical composition for modified release of the present invention, is a formulation for modified release containing a water-soluble high molecular weight polymer which swells upon imbibition of water.

Formulation techniques using a swelling polymer which may be used in the formulation for modified release of the present invention are described in U.S. Pat. Nos. 6,340,475, 5,972,389, 5,582,837, and 5,007,790, the contents of which are incorporated herein by reference.

The “water-soluble high molecular weight polymer which swells upon imbibition of water” used is not particularly limited, so long as it is a pharmaceutically acceptable polymer that swells in a dimensionally unrestricted manner upon imbibition of water, and that releases a drug continuously. Suitable polymers are those having a weight average molecular weight of preferably approximately 4,500,000 or more, more preferably approximately 4,500,000 to approximately 10,000,000, most preferably approximately 5,000,000 to approximately 8,000,000.

Such polymers include cellulose polymers and derivatives thereof, polysaccharides and derivatives thereof, polyalkylene oxides, and crosslinked polyacrylic acids and derivatives thereof. The term “cellulose” as used herein means a linear polymer of anhydroglucose. Preferred cellulose polymers are alkyl-substituted cellulose polymers that dissolve in the gastrointestinal tract. Preferred alkyl-substituted cellulose derivatives are those substituted with alkyl groups having 1 to 3 carbon atoms each. Examples thereof include, for example, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hypromellose, and carboxymethylcellulose. A preferred viscosity ranges between approximately 100 and approximately 110,000 cps, as measured in a 2% aqueous solution at 20° C. A viscosity in other embodiments ranges between approximately 1,000 and approximately 4,000 cps, as measured in a 2% aqueous solution at 20° C. More preferred alkyl-substituted celluloses are hydroxyethylcellulose and hypromellose. Preferred hydroxyethylcellulose is NATRASOL (product name) 250H×NF.

Further, most preferred polymers are polyalkylene oxide derivatives, particularly polyethylene oxide, i.e., an unsubstituted linear polymer of ethylene oxide. Preferred polyethylene oxide has a weight average molecular weight of approximately 900,000 to approximately 8,000,000. A preferred viscosity ranges between approximately 50 to approximately 2,000,000 cps, as measured in a 2% aqueous solution at 20° C. Preferred polyethylene oxide is POLYOX (product name), such as grade WSR Coagulant and grade WSR 303

Other examples of such polymers include both naturally-occurring and modified (semi-synthetic) polysaccharide gums, such as dextran, xanthan gum, gellan gum, welan gum, and rhamsan gum. Xanthan gum is preferred. Crosslinked polyacrylic acids of greatest utility are those whose properties are the same as those described above for alkyl-substituted celluloses and polyalkylene oxide polymers. Preferred crosslinked polyacrylic acids are those with a viscosity ranging from approximately 4,000 to approximately 40,000 cps, for a 1% aqueous solution at 25° C. Preferred examples are CARBOPOL (product name) NF grades 971P, 974P, and 934P, and WATER LOCK (product name) which are starch/acrylates/acrylamide copolymers.

The content of the “water-soluble high molecular weight polymer which swells upon imbibition of water” with respect to the weight of the formulation is not particularly limited, but is preferably approximately 1 to approximately 95 W/W %.

The formulation utilizing a swelling polymer, an embodiment of the pharmaceutical composition for modified release of the present invention, can be prepared as a pharmaceutically acceptable solid dosage form for oral administration such as tablets, particles, and particles retained in tablets or capsules. A presently preferred dosage form is a size 0 gelatin capsule containing two or three polymer particles (pellets) containing a drug. For the two-pellet capsules, the pellets are cylindrically shaped, 6.6 or 6.7 mm (or more generally, 6.5 to 7 mm) in diameter and 9.5 or 10.25 mm (or more generally, 9 to 12 mm) in length. For the three-pellet capsules, the pellets are cylindrically shaped, 6.6 mm in diameter and 7 mm in length. For a size 00 gelatin capsule with two pellets, the pellets are cylindrical, 7.5 mm in diameter and 11.25 mm in length. For a size 00 gelatin capsule with three pellets, the pellets are cylindrical, 7.5 mm in diameter and 7.5 mm in length. Another presently preferred dosage form is a tablet, with dimensions 18 to 22 mm in length, 6.5 to 7.8 mm in width, and 6.2 to 7.5 mm in height, more preferably with dimensions 20 mm in length, 6.7 mm in width, and 6.4 mm in height. These are merely examples, and the shapes and sizes can be varied considerably.

A particulate drug/polymer mixture or a drug-impregnated polymer matrix can be prepared by various known conventional methods, such as mixing, comminution, and fabrication techniques. These methods include, for example, direct compression using appropriate punches and dies, injection, and compression molding. When compression molding is carried out, lubricants may be optionally added. Examples of lubricants include stearic acid, magnesium stearate, calcium stearate, sodium stearyl fumarate, and the like, and magnesium stearate is preferred. The content of the lubricant is 0.25 to 3 W/W %, preferably less than 1 W/W %, with respect to the weight of the formulation. As other lubricants, hydrogenated vegetable oils, and hydrogenated and refined triglycerides of stearic and palmitic acids are preferable, and the content is approximately 1 to 5 W/W %, preferably approximately 2 W/W %, with respect to the weight of the formulation.

Most preferable sets of various components described above include a combination of approximately 90 to approximately 97 W/W % (with respect to the weight of the formulation) of polyethylene oxide having a weight average molecular weight of approximately 2,000,000 to approximately 7,000,000 as the “water-soluble high molecular weight polymer which swells upon imbibition of water” and less than approximately 2 W/W % (with respect to the weight of the formulation) of magnesium stearate as the lubricant. Examples of a combination of, for example, two water-soluble polymers include a combination of approximately 48 W/W % of polyethylene oxide having a weight average molecular weight of approximately 900,000 to approximately 7,000,000 and approximately 48 W/W % of hypromellose having a viscosity of approximately 3 to approximately 10,000 cps, as measured in a 2% aqueous solution at 20° C. (weight ratio=about 1:1).

It is expected that the formulation utilizing a swelling polymer is retained in the stomach by swelling.

(6) Matrix Formulation Utilizing Water-Soluble Polymer

The matrix formulation utilizing water-soluble polymer, an embodiment of the pharmaceutical composition for modified release of the present invention, is a formulation for modified release in which the drug is homogenously dispersed in one or more water-soluble polymers, such as hypromellose (HPMC).

Techniques for obtaining such a matrix formulation which may be used in the formulation for modified release according to the present invention are disclosed, for example, in WO 93/16686, the contents of which are incorporated herein by reference.

When hypromellose, a water-soluble polymer, is brought into contact with water, hydration thereof is caused, and a hydrogel layer is formed on the surface of a matrix. This gel layer containing a drug formed on the matrix surface is gradually dissolved and eroded, to release the drug from the layer. The matrix formulation of the present invention is characterized in that a drug may be controllably released by repeating the contact with water, the formation of the gel layer containing the drug, and the dissolution and erosion of the gel layer.

The matrix formulation of the present invention is characterized in that a sustained release filler consisting of a water-soluble polymer, an inactive diluent, and a physiologically active substance are homogenously dispersed. The water-soluble polymer is not particularly limited, so long as it is gradually gelled, eroded, dissolved, and/or disintegrated when exposed to an environmental fluid. Examples of the water-soluble polymers include, for example, hypromellose having a molecular weight of 1,000 to 4,000,000, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose having a molecular weight of 2,000 to 2,000,000, hypromellose phthalate having a labeled viscosity of 30 to 200 mm²/s [at 20° C.; a 10% solution prepared by dissolving hypromellose phthalate in a methanol/dichloromethane mixture (1:1)], carboxyvinyl polymers, chitosans, mannans, galactomannans, xanthans, carageenans, amylose, alginic acid, salts and derivatives thereof, pectin, acrylates, aminoalkylmethacrylate copolymers, methacrylate copolymers, polyacid anhydrides, polyamino acids, poly(methylvinyl ether/maleic anhydride) polymers, polyvinyl alcohols, polyvinylpyrrolidone, glucans, scleroglucans, carboxymethyl cellulose and derivatives thereof, methyl cellulose, or conventional water-soluble cellulose derivatives. Hypromellose having a molecular weight of 1,000 to 2,000,000, or carboxyvinyl polymers of 3,000 to 45,000 cps (at 25° C.; a 0.5% aqueous solution) is preferable, and hypromellose having a molecular weight of 10,000 to 1,000,000, or carboxyvinyl polymers of 4,000 to 40,000 cps (at 25° C.; a 0.5% aqueous solution) is more preferable. The content of the water-soluble polymer is 10 W/W % or more per formulation unit, preferably 30 W/W % or more, more preferably 70 W/W % or more. These water-soluble polymers may be contained alone or as a combination thereof in an appropriate amount(s).

Various fillers for medicaments may be appropriately used to prepare the matrix formulation of the present invention. The fillers for medicaments are not particularly limited, so long as they are pharmaceutically acceptable and may be used as additives for medicament. As the fillers, for example, a diluent, a binder, a disintegrator, an acidulant, an effervescent agent, an artificial sweetener, a flavor, a lubricant, a coloring agent, or the like may be used. The diluent may be selected from mannitol, lactose, starches derived from various organs, sorbitol, xylitol, citric acid, microcrystalline cellulose, and/or a diluent capable of generally promoting a penetration of water or an aqueous liquid into a pharmaceutical preparation. The binders include, for example, hypromellose, hydroxypropyl cellulose, polyvinyl alcohol, methyl cellulose, gum arabic, and the like. The disintegrators include, for example, a corn starch, a starch, carmellose calcium, carmellose sodium, low-substituted hydroxypropyl cellulose, and the like. The acidulants include, for example, citric acid, tartaric acid, malic acid, and the like. The effervescent agents include, for example, sodium bicarbonate and the like. The artificial sweeteners include, for example, saccharin sodium, dipotassium glycyrrhizinate, aspartame, stevia, thaumatin, and the like. The flavors include, for example, lemon, lemon-lime, orange, menthol, and the like. The lubricants include, for example, magnesium stearate, calcium stearate, sucrose fatty acid esters, polyethylene glycol, talc, stearic acid, and the like. These fillers for medicaments may be contained alone or as a combination thereof in an appropriate amount(s).

The matrix formulation of the present invention may be manufactured by a known method per se. In particular, tablets may be manufactured by a tablet forming method which is commonly used and known to those skilled in the art. The tabletting pressure is generally within a range of 3 to 20 kN. In a small scale, tablets may be prepared, in accordance with methods explained in detail in the following Examples, by preparing powder and/or granules with a mortar and a pestle, and forming the powder and/or granules into tablets by using an oil press tabletting machine.

(7) Modified Release Formulation with Coating Membrane

As a method for controlling the release (i.e., modified release) of a drug from a pharmaceutical preparation, a coating membrane is applied to the surface of a pharmaceutical preparation by coating. The kind of coating membrane is not particularly limited. The coating may be applied to not only a shaped preparation such as a tablet or the like, but also various preparations such as powder, granules, pellets, or the like.

A coating liquid may contain, for example, a membrane forming agent (mainly a polymer), a plasticizer (which provides plasticity, flexibility, and extensibility to a coating membrane), a water-soluble base (such as lactose, sodium chloride, or the like), a dispersing agent (which prevents particles or tablets from adhering and aggregating after the coating), or the like. These components may be dissolved or dispersed in an appropriate solvent, such as water, alcohol, or the like, to prepare the coating liquid.

The release of a drug from the formulation can be controlled by appropriately adjusting, for example, the kinds and the mixing ratio of components contained in the coating liquid, the amount of coating, or the like. For example, a preferable ratio of the membrane forming agent to the water-soluble base is 99:1 to 50:50 (membrane forming agent: water-soluble base). The content of the coating membrane is preferably approximately 2 to 30 parts by weight, with respect to 100 parts by weight of an uncoated tablet.

Examples of a coating method include, for example, a method in which a coating liquid, such as an organic solvent solution, or a mixing solution or suspension of an organic solvent and water, is sprayed while being rotated, by using a coating pan, or a method in which a coating liquid is sprayed while being fluidized by air blown from the bottom of a fluidized bed. Further, a coating liquid prepared by dissolving or dispersing a membrane forming agent in a solvent may be sprayed, and then the solvent may be removed by drying to form a coating membrane on the surface of a pharmaceutical preparation. As a simple method, a coating membrane may be formed by immersing shaped preparations or the like in a coating liquid.

Examples of the membrane forming agent as used herein include, for example, a water-insoluble polymer or a water-soluble polymer. The membrane forming agent is not particularly limited, so long as it is pharmaceutically acceptable and biocompatible. These membrane forming agents may be added alone or as a combination thereof in an appropriate amount(s).

Examples of the water-insoluble polymer include, for example, dibenzyl phthalate, dihexyl phthalate, butyl octyl phthalate, beeswax, carnauba wax, cetyl alcohol, cetyl stearyl alcohol, glyceryl behenate, lipids, fats, resins such as shellac or the like, cellulose derivatives such as ethyl cellulose, cellulose acetate, or the like, polyacrylate derivatives such as aminoalkylmethacryl copolymer (product name: Eudragit RS) or the like, polymethacrylate derivatives such as methacrylate copolymer (product name: Eudragit L) or the like, hydroxypropylmethyl cellulose acetate succinate, polylactic acid, polyglycolic acid, or the like.

Examples of the water-soluble polymer include, for example, hypromellose, hydroxypropyl cellulose, hydroxyethyl cellulose, carmellose sodium, methyl cellulose, polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, or the like.

To enhance the hydrophilic property of the coating membrane, a water-soluble base may be added. Examples of the water-soluble base include, for example, maltose, sucrose, lactose, sodium chloride, citric acid, polyethylene glycol 400, dextrose, fructose, xylitol, polyoxyethylene sorbitan monooleate, or the like.

The coating liquid which may be used in the present invention preferably contains one or more of the above-mentioned water-insoluble polymers, and more preferably further contains one or more of the water-soluble polymers and/or one or more of the water-soluble bases.

Further, the coating liquid may contain a plasticizer to provide plasticity, flexibility, and extensibility to the coating membrane. Examples of the plasticizer include, for example, triacetin, dioctyl azelate, epoxidized tallate, triisooctyl trimellitate, triisononyl trimellitate, sucrose acetate isobutyrate, soybean oil, propylene glycol, glycerol, polyethylene glycol, glyceryl triacetate (triacetin), triethyl citrate, acetyl triethyl citrate, diethyl phthalate, diethyl sebacate, dibutyl sebacate, acetylated monoglyceride, castor oil, liquid paraffin, or the like.

If desired, a surfactant and/or a disintegrator may be added. As such a surfactant which may be used in the coating membrane, a surfactant having an HLB value of approximately 10 to 25, such as polyethylene glycol 400 monostearate, polyoxyethylene-4-sorbitan monolaurate, polyoxyethylene-20-sorbitan monooleate, polyoxyethylene-20-sorbitan monopalmitate, polyoxyethylene-20-monolaurate, polyoxyethylene-40-stearate, sodium oleate, or the like, may be used.

Examples of the disintegrator include, for example, starches, clay, cellulose, algin, gums, crosslinked starches, crosslinked cellulose, or crosslinked polymers. Typically, for example, corn starch, potato starch, croscarmellose, crospovidone, sodium starch glycorate, Veegum HV, methyl cellulose, agar, bentonite, carboxyl methyl cellulose, alginic acid, guar gum, or the like, may be used.

As a solvent suitable for manufacturing the formulation of the present invention, an aqueous or inert organic solvent which does not adversely affect substances used in the system may be used. Examples of the solvent include, for example, aqueous solvents, alcohols, ketones, esters, ethers, aliphatic hydrocarbons, halogenated solvents, cycloaliphatic, aromatic, or heterocyclic solvents, or a mixture thereof. Typical solvents may be, for example, acetone, diacetone alcohol, methanol, ethanol, isopropanol, butanol, methyl acetate, ethyl acetate, isopropyl acetate, n-butyl acetate, methyl isobutyl ketone, methyl propyl ketone, n-hexane, n-heptane, ethylene glycol monoethyl ether, ethylene glycol monoethyl acetate, methylene dichloride, ethylene dichloride, propylene dichloride, carbon tetrachloride, nitroethane, nitropropane, tetrachloroethane, ethyl ether, isopropyl ether, cyclohexane, cyclooctane, benzene, toluene, naphtha, 1,4-dioxane, tetrahydrofuran, diglyme, water, an aqueous solvent containing an inorganic salt such as sodium chloride, calcium chloride, or the like, or a mixture thereof, such as a mixture of acetone and water, a mixture of acetone and methanol, a mixture of acetone and ethanol, a mixture of methylene dichloride and methanol, or a mixture of ethylene dichloride and methanol.

(8) Matrix Formulation Utilizing Insoluble Polymer

A matrix formulation utilizing an insoluble polymer, an embodiment of the present invention, is a pharmaceutical composition for modified release in which the drug is uniformly dispersed in a water-insoluble polymer. Because the matrix consisting of the water-insoluble polymer can control the penetration of water into the formulation, the matrix formulation can modify the release of the drug from the formulation by controlling the dissolution rate of the drug in the matrix and the dispersion rate of the dissolved drug in the matrix.

The water-insoluble polymer used in the present invention is not particularly limited, so long as it is pharmaceutically acceptable. Examples of the water-insoluble polymer include, for example, dibenzyl phthalate, dihexyl phthalate, butyl octyl phthalate, beeswax, carnauba wax, cetyl alcohol, cetyl stearyl alcohol, glyceryl behenate, lipids, fats, resins such as shellac or the like, cellulose derivatives such as ethyl cellulose, cellulose acetate, or the like, polyacrylate derivatives such as aminoalkylmethacryl copolymer or the like, polymethacrylate derivatives such as methacrylate copolymer, ethyl acrylate methyl methacrylate copolymer or the like, hydroxypropylmethyl cellulose acetate succinate, polylactic acid, polyglycolic acid, or the like.

The content of the insoluble polymer is 1 W/W % or more per formulation unit, preferably 2 W/W % or more, more preferably 5 W/W % or more. These insoluble polymers may be contained alone or as a combination thereof in an appropriate amount(s).

Various fillers for medicaments may be appropriately used to prepare the matrix formulation of the present invention. The fillers for medicaments are not particularly limited, so long as they are pharmaceutically acceptable and may be used as additives for medicament. As the fillers, for example, a diluent, a binder, a disintegrator, an acidulant, an effervescent agent, an artificial sweetener, a flavor, a lubricant, a coloring agent, or the like may be used. The diluent may be selected from mannitol, lactose, starches derived from various organs, sorbitol, xylitol, citric acid, microcrystalline cellulose, and/or a diluent capable of generally promoting a penetration of water or an aqueous liquid into a pharmaceutical preparation. The binders include, for example, hypromellose, hydroxypropyl cellulose, polyvinyl alcohol, methyl cellulose, gum arabic, and the like. The disintegrators include, for example, a corn starch, a starch, carmellose calcium, carmellose sodium, low-substituted hydroxypropyl cellulose, and the like. The acidulants include, for example, citric acid, tartaric acid, malic acid, and the like. The effervescent agents include, for example, sodium bicarbonate and the like. The artificial sweeteners include, for example, saccharin sodium, dipotassium glycyrrhizinate, aspartame, stevia, thaumatin, and the like. The flavors include, for example, lemon, lemon-lime, orange, menthol, and the like. The lubricants include, for example, magnesium stearate, calcium stearate, sucrose fatty acid esters, polyethylene glycol, talc, stearic acid, and the like. These fillers for medicaments may be contained alone or as a combination thereof in an appropriate amount(s).

The matrix formulation of the present invention may be manufactured by a known method per se. In particular, tablets may be manufactured by a tablet forming method which is commonly used and known to those skilled in the art. The tabletting pressure is generally within a range of 3 to 20 kN. In a small scale, tablets may be prepared, in accordance with methods explained in detail in the following Examples, by preparing powder and/or granules with a mortar and a pestle, and forming the powder and/or granules into tablets by using an oil press tabletting machine.

EXAMPLES

The present invention will now be further illustrated by, but is by no means limited to, the following Examples.

In the following Examples, unless otherwise noted, a compound produced according to Example 41 of WO 99/20607 was used as compound A.

Example 1 Preparation of Sustained Release Hydrogel-Forming Formulation

In this Example, as the pharmaceutical composition for modified release of the present invention, sustained release hydrogel-forming formulations 1A to 1C were prepared.

Example 1A

400 g of the compound A, 100 g of polyethylene oxide, 291.2 g of polyethylene glycol, 0.8 g of finely ground dibutyl hydroxytoluene (BHT) (manufactured by Merck, the same was used hereinafter), and 8 g of magnesium stearate were weighed out, and mixed by using a mixer. The mixture was compression-molded by using Roller Compactor Mini (manufactured by Freund Corporation; the same apparatus was used hereinafter) and sieved to obtain a pharmaceutical composition for modified release (granules) of the present invention. The obtained granules were formed into tablets by using a rotary tabletting machine (manufactured by HATA IRON WORKS CO., LTD.; the same apparatus was used hereinafter) to obtain 400 mg/tablet of a pharmaceutical composition for modified release (tablet) of the present invention. The obtained tablet was coated with a film coating agent dispersed in water (Opadry, manufactured by Colorcon, Inc., the same was used hereinafter) by using High coater (HCT-30, manufactured by Freund Corporation, the same apparatus was used hereinafter) to obtain a pharmaceutical composition for modified release (tablet) of the present invention.

Example 1B

400 g of the compound A, 250 g of polyethylene oxide, 190.7 g of polyethylene glycol, 0.8 g of finely ground BHT, and 8.5 g of magnesium stearate were weighed out, and mixed by using a mixer. The mixture was compression-molded by using Roller Compactor Mini, and then sieved to obtain a pharmaceutical composition for modified release (granules) of the present invention. The obtained granules were formed into tablets by using a rotary tabletting machine to obtain 425 mg/tablet of a pharmaceutical composition for modified release (tablet) of the present invention. The obtained tablet was coated with a film coating agent dispersed in water by using High coater to obtain a pharmaceutical composition for modified release (tablet) of the present invention.

Example 1C

Into a fluidized bed granulating apparatus GPCG-5 (manufactured by Freund Corporation; the same apparatus was used hereinafter), 800 g of de-lumped compound A, 1120 g of polyethylene oxide, 1913.6 g of polyethylene glycol, and 120 g of hydroxypropylcellulose (HPC-SL, manufactured by Nippon Soda Co., Ltd.) were loaded, and granulated with purified water to obtain a pharmaceutical composition for modified release (granules) of the present invention. The pharmaceutical composition for modified release (granules) of the present invention was sieved, and mixed with 6.4 g of finely ground BHT and 40 g of magnesium stearate, and the obtained mixture was formed into tablets by using the rotary tabletting machine to obtain a pharmaceutical composition for modified release (tablet) of the present invention having a weight per tablet of 250 mg. The obtained tablets were spray-coated with an aqueous dispersion of the film coating agent using HiCoater to obtain a pharmaceutical composition for modified release (tablet) of the present invention having a weight per tablet of 257.5 mg.

Comparative Example 1

After 400 g of de-lumped compound A was mixed with 1200 g of D-mannitol, 320 g of purified water was added thereto, and the mixture was kneaded by using an agitation granulator (VG-25, manufactured by Powrex Corporation). The resulting product was sieved through a screen (opening: 850 μm), and dried by using a fluidized bed granulating apparatus (FLO-1, manufactured by Freund Corporation). The dried product was sieved through a screen (opening: 500 μm), and then filled into No. 1 capsules at a content of 320 mg per capsule to obtain a pharmaceutical composition of Comparative Example containing 80 mg of compound A.

Example 2 Preparation of Multi-Layered Formulation Consisting of Drug Core and Release-Controlling Layer which are Geometrically Arranged

In the Examples (Examples 2A to 2D), as the pharmaceutical composition for modified release of the present invention, multi-layered formulations 2A to 2D were prepared.

Step 1: Production of Mixed Powder Constituting Layer 2 Containing Active Substance

A mixed powder containing 50.0 mg of compound A and the composition unit shown in Table 1 was produced, and used in producing layer 2 as the intermediate layer of the three-layered tablet. The powder composed of the composition unit was prepared by weighing out necessary amounts of the active substance (compound A), mannitol, Hypromellose (90SH-15000, manufactured by Shin-Etsu Chemical Co. Ltd), polyvinyl pyrrolidone, microcrystalline cellulose, and magnesium stearate, and mixing them with a mortar and a pestle so that they were homogenized.

TABLE 1 Compound A 50.0 mg Mannitol 15.0 mg Hypromellose (90SH-15000) 15.0 mg Polyvinyl pyrrolidone 4.8 mg Microcrystalline cellulose 63.7 mg Magnesium stearate 1.5 mg Total 150.0 mg

Step 2: Production of Granules Constituting Layers 1 and 3 (Layers 1 and 3 Containing No Drug) Used for Modified Release of Drug

Granules made with the composition ratio shown in Table 2 were produced and used in producing layer 1 as the top layer and layer 3 as the bottom layer of the three-layered tablet. Specifically, the granules were prepared by weighing out necessary amounts of hypromellose, hydrogenated castor oil, yellow iron oxide, and magnesium stearate; mixing them by the use of a mortar and a pestle so that they were homogenized; further moistening them with a solution of ethylcellulose in alcohol (10% w/w); and drying the homogeneously wet aggregate.

TABLE 2 Hypromellose (90SH-15000) 80.25% Hydrogenated castor oil 13.50% Yellow iron oxide 0.25% Ethylcellulose 5.00% Magnesium stearate 1.00% Total 100.00%

Step 3: Production of Three-Layered Tablet (Compression Molding)

Three-layered tablet were prepared by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch. The granules of layer 3 prepared in Step 2 were put into a die, and subjected to light tapping so that the upper surface became flat. On the surface, the mixed powder of layer 2 containing the active substance prepared in Step 1 was loaded, which was subjected to light tapping so that the upper surface became flat. Furthermore, on the surface, the granules of the layer 1 prepared in the Step 2 were loaded into the die, and subjected to compression molding. Thus, three-layered tablets containing 50 mg of compound A (2A to 2D) were produced.

The weight and the punch diameter of each of layers 1, 2, and 3 in each of multi-layered formulations 2A to 2D are shown in Table 3.

TABLE 3 Examples 2 A 2 B 2 C 2 D Layer 1 100.0 100.0 100.0 100.0 Layer 2 150.0 300.0 150.0 150.0 Layer 3 150.0 150.0 150.0 150.0 Total (mg) 400.0 550.0 400.0 400.0 Punch 8 8 7 6.5 diameter (mm)

Example 3 Preparation of Gel Formulation in which a Plurality of Gums is Combined

In this Example, as the pharmaceutical composition for modified release of the present invention, a gel formulation composed of the composition unit shown in Table 4 was prepared.

Specifically, necessary amounts of locust bean gum (GENUGUM type RL-200-J, manufactured by Sansho Co., Ltd.), xanthan gum (VS-900, manufactured by Nitta Gelatin Inc.), dextrose, and calcium sulfate were weighed out, and mixed sufficiently by using a mortar and a pestle so that the mixture was homogenized. Furthermore, an appropriate amount of purified water was added thereto, and the mixture was stirred and mixed. The mixture was sieved through a screen, and the obtained product was dried. To the dried product, a necessary amount of compound A was added. To the mixture, a solution of ethylcellulose in alcohol (100 mg/mL) was gradually added. The mixture was dried, and the dried product was put into a die, and subjected to compression molding by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch by using a punch having a diameter of 8 mm.

TABLE 4 Compound A 50.0 mg Locust bean gum (GENUGUM type RL-200-J) 50.0 mg Xanthan gum (VS-900) 50.0 mg Dextrose 70.0 mg Calcium sulfate 10.0 mg Ethylcellulose 14.0 mg Total 244.0 mg 

Example 4 Preparation of Osmotic Pump Type Formulation

In this Example, as the pharmaceutical composition for modified release of the present invention, an osmotic pump type formulation was prepared.

Step 1: Production of Mixed Powder Constituting Drug Layer Containing Active Substance

Mixed powder containing 50.0 mg of compound A and the composition unit shown in Table 5 was produced, and it was used in producing a bilayered compressed core.

The powder composed of the composition unit was prepared by weighing out necessary amounts of active substance (compound A), polyethylene oxide (Polyox WSR N-80, manufactured by DOW), hypromellose (TC-5 R, manufactured by Shin-Etsu Chemical Co. Ltd.), and magnesium stearate, and mixing them sufficiently by using a mortar and a pestle so that they were homogenized.

TABLE 5 Compound A 50.0 mg Polyethylene oxide (Polyox WSR N-80) 100.0 mg Hypromellose (TC-5 R) 6.0 mg Magnesium stearate 1.0 mg Total 157.0 mg

Step 2: Production of Mixed Powder Constituting Push Layer

A mixed powder composed of the composition unit shown in Table 6 was produced, and it was used in producing the bilayered compressed core.

Specifically, the mixed powder was produced by weighing out necessary amounts of polyethylene oxide (Polyox WSR Coagulant, manufactured by DOW), sodium chloride, hypromellose, red ferric oxide, and magnesium stearate, and mixing them sufficiently by using a mortar and a pestle so that they were homogenized.

TABLE 6 Polyethylene oxide (Polyox WSR Coagulant) 60.0 mg Sodium chloride 30.0 mg Hypromellose (TC-5 R) 4.0 mg Red ferric oxide 1.0 mg Magnesium stearate 0.5 mg Total 95.5 mg

Step 3: Production of Bilayered Compressed Core Composed of Drug Layer and Push Layer

A bilayered compressed core was prepared by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch. The mixed powder for a push layer prepared in Step 2 was put into a die, the mixed powder for a drug layer prepared in Step 1 was loaded thereon, and the both layers were subjected to compression molding to produce a bilayered compressed core containing 50 mg of compound A.

Step 4: Production of Semi-Permeable Membrane and Membrane Coating

Necessary amounts of polyethylene glycol 4000 and cellulose acetate (mass ratio of 6:94) were dissolved in a mixed solvent of dichloromethane and methanol (mass ratio of 9:1) to prepare a coating solution having a solid concentration of 2% w/w. By using this solution, a film coating was formed so that the coating component was 5% w/w with respect to the bilayered compressed core.

Step 5: Punching

A needle (27G) having a diameter of 0.4 mm was used to form orifices at the drug layer side of the semi-permeable-membrane-coated tablets prepared in Step 4, to prepare an osmotic pump type formulation as the pharmaceutical composition for modified release of the present invention.

Example 5 Preparation of Formulation Using Swelling Polymer

In the Examples (Examples 5A to 5C), as the pharmaceutical composition for modified release of the present invention, formulations 5A to 5C using a swelling polymer composed of the composition unit shown in Table 7 were prepared.

Specifically, necessary amounts of compound A and polyethylene oxide (various types of Polyox, manufactured by DOW) were weighed out, and mixed sufficiently by using a mortar and a pestle so that they were homogenized. The mixture was put into a die and subjected to compression molding by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch by using a punch having a diameter of 7 mm.

TABLE 7 Examples 5 A 5 B 5 C Compound A  50.0  50.0  50.0 Polyethylene oxide 200.0 — — (Polyox WSR N-60K) Polyethylene oxide — 200.0 — (Polyox WSR N-12K) Polyethylene oxide — — 200.0 (Polyox WSR N-205) Total (mg) 250.0 250.0 250.0

Example 6 Preparation of Matrix Formulation Using Water-Soluble Polymer

In the Examples (Examples 6A to 6N), as the pharmaceutical composition for modified release of the present invention, matrix formulations 6A to 6N composed of the composition units shown in Tables 8 and 9 were prepared.

Specifically, necessary amounts of compound A and various additives [hypromellose (manufactured by Shin-Etsu Chemical Co. Ltd) or hydroxypropylcellulose (manufactured by Nippon Soda Co., Ltd.)] were weighed out, and mixed sufficiently by using a mortar and a pestle so that they were homogenized. The mixture was put into a die and subjected to compression molding by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch.

TABLE 8 Examples 6 A 6 B 6 C 6 D 6 E 6 F Compound A 100.0 100.0 100.0 100.0 100.0 100.0 Hypromellose 200.0 — —  50.0 — — (METLOSE SR 90SH-100SR) Hypromellose — 200.0 — —  25.0 — (METLOSE SR 90SH- 4000SR) Hypromellose — — 200.0 — —  25.0 (METLOSE SR 90SH- 15000SR) Total (mg) 300.0 300.0 300.0 150.0 125.0 125.0

TABLE 9 Examples 6 G 6 H 6 I 6 J 6 K 6 L 6 M 6 N Compound A 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 Hydroxypropyl — — — —  50.0 — — — cellulose (HPC-L) Hydroxypropyl 200.0 — 100.0  50.0 —  25.0 — — cellulose (HPC-M) Hydroxypropyl — 200.0 — — — —  25.0  10.0 cellulose (HPC-H) Total (mg) 300.0 300.0 200.0 150.0 150.0 125.0 125.0 110.0

Example 7 Preparation of Modified Release Formulation with Coating Membrane

In the Examples (Examples 7A to 7E), as the pharmaceutical composition for modified release of the present invention, modified release formulations 7A to 7E with a coating membrane composed of the composition unit shown in Table 10 were prepared.

Specifically, firstly, necessary amounts of the compound A and additives of a core tablet were weighed out, and mixed sufficiently by using a mortar and a pestle so that they were homogenized. The mixture was put into a die and subjected to compression molding by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch to produce each core tablet. Additionally, necessary amounts of film coating components [as aminoalkyl methacrylate copolymer RS, various types of Eudragit, manufactured by Degussa corporation; and as Hypromellose, TC-5 E manufactured by Shin-Etsu Chemical Co. Ltd] were dissolved/dispersed in ethanol to prepare each coating solution having a solid concentration of 10% w/w. By using each solution, film coating was conducted so that the coating component had a prescribed amount with respect to the core tablet.

TABLE 10 Examples 7 A 7 B 7 C 7 D 7 E Core tablet Compound A 100.0 100.0 100.0 100.0 100.0 Mannitol 100.0 — — — — Polyethylene glycol 8000 — 200.0 200.0 200.0 200.0 Subtotal (mg) 200.0 300.0 300.0 300.0 300.0 Film coat Aminoalkyl methacrylate — —  15.0  30.0  22.5 Copolymer RS (Eudragit RL PO) Aminoalkyl methacrylate  10.0  12.0 — — — Copolymer RS (Eudragit RS PO) Hypromellose (TC-5 E) — — — —  7.5 Subtotal (mg)  10.0  12.0  15.0  30.0  30.0 Total (mg) 210.0 312.0 315.0 330.0 330.0

Example 8 Preparation of Matrix Formulation Using Insoluble Polymer Examples 8A to 8C

As the pharmaceutical composition for modified release of the present invention, matrix formulations (tablets) 8A to 8C composed of the composition unit shown in Table 11 were prepared.

Specifically, necessary amounts of the compound A and ethylcellulose (Ethocel 10 premium, manufactured by DOW) were weighed out, and mixed sufficiently by using a mortar and a pestle so that they were homogenized. The mixture was put into a die and subjected to compression molding by an oil press tabletting machine with a tabletting pressure of 1000 kg/punch.

TABLE 11 Examples 8 A 8 B 8 C Compound A 100.0 100.0 100.0 Ethylcellulose 200.0 25.0 10.0 (Ethocel 10 premium) Total (mg) 300.0 125.0 110.0

Examples 8D and 8E

As the pharmaceutical composition for modified release of the present invention, matrix formulations (granules) 8D to 8E composed of the composition unit shown in Table 12 were prepared.

Specifically, necessary amounts of the compound A and ethylcellulose shown in Table 12 were weighed out, and mixed sufficiently by using a mortar and a pestle so that they were homogenized. Furthermore, an appropriate amount of ethanol was added thereto, and the mixture was stirred and mixed. The mixture was dried, and screened by using a sieve so as to remove coarse particles to prepare granule formulations 8D and 8E for modified release as the pharmaceutical composition for modified release of the present invention.

TABLE 12 Examples 8 D 8 E Compound A 25.0 50.0 Ethylcellulose 75.0 100.0 Total (mg) 100.0 150.0

Examples 8F and 8G

Necessary amounts of the compound A and microcrystalline cellulose shown in Table 13 were weighed out, and mixed sufficiently by using a mortar and a pestle so that they were homogenized. Furthermore, a prescribed amount of solution of ethylcellulose in ethanol was added thereto, and the mixed solution was stirred and mixed. The mixture was dried and screened by using a sieve so as to remove coarse particles to prepare granule formulations 8F and 8G for modified release as the pharmaceutical composition for modified release of the present invention.

TABLE 13 Examples 8 F 8 G Compound A 50.0 50.0 Microcrystalline cellulose — 50.0 Ethylcellulose  8.0 10.0 Total (mg) 58.0 110.0

Experimental Example 1 Dissolution Test of Sustained Release Hydrogel-Forming Formulation

A drug release property from each of the formulations prepared in Examples 1A to 1C was evaluated by the dissolution test, method 2 (paddle method) described in the Japanese Pharmacopoeia. The test was carried out using 900 mL of a USP phosphate buffer (pH 6.8) as a test solution at a paddle rotating speed of 200 rpm. The drug concentration in the test solution was measured every hour, and the drug release property was evaluated. The results are shown in Table 14 and FIG. 1.

TABLE 14 Examples 1 A 1 B 1 C Dissolution rate 54 15 27 1.5 hours Dissolution rate 80 31 52 2.5 hours Dissolution rate 99 66 95 7 hours

Experimental Example 2 Dissolution Test of Multi-Layered Formulation Consisting of Drug Core and Release-Controlling Layer which are Geometrically Arranged

A drug release property from each of the formulations prepared in Examples 2A to 2D was evaluated by the method described in Experimental Example 1. The results are shown in Table 15 and FIG. 2.

TABLE 15 Examples 2 A 2 B 2 C 2 D Dissolution rate 19 19 18 21 1.5 hours Dissolution rate 26 32 25 30 2.5 hours Dissolution rate 57 75 73 88 7 hours

Experimental Example 3 Dissolution Test of Gel Formulation in which a Plurality of Gums is Combined

A drug release property from the formulation prepared in Example 3 was evaluated by the method described in Experimental Example 1. The results are shown in FIG. 3. As a result, the dissolution rates after 1.5 hours, 2.5 hours, and 7 hours were 11%, 18%, and 78%, respectively.

Experimental Example 4 Dissolution Test of Osmotic Pump Type Formulation

A drug release property from the formulation prepared in Example 4 was evaluated by the method described in Experimental Example 1. The results are shown in FIG. 4. As a result, the dissolution rates after 1.5 hours, 2.5 hours, and 7 hours were 21%, 43%, and 90%, respectively.

Experimental Example 5 Dissolution Test of Formulation Using Swelling Polymer

A drug release property from each of the formulations prepared in Examples 5A to 5C was evaluated by the method described in Experimental Example 1. The results are shown in Table 16 and FIG. 5.

TABLE 16 Examples 5 A 5 B 5 C Dissolution rate 13 20 26 1.5 hours Dissolution rate 23 38 47 2.5 hours Dissolution rate 67 91 96 7 hours

Experimental Example 6 Dissolution Test of Matrix Formulation Using Water-Soluble Polymer

A drug release property from each of the formulations prepared in Examples 6A to 6N was evaluated by the method described in Experimental Example 1. The results are shown in Tables 17 and 18 and FIGS. 6 and 7.

TABLE 17 Examples 6 A 6 B 6 C 6 D 6 E 6 F 6 G Dissolution rate 18 7 6 38 40 34 7 1.5 hours Dissolution rate 29 11 10 59 51 43 12 2.5 hours Dissolution rate 76 35 26 98 85 76 34   7 hours

TABLE 18 Examples 6 H 6 I 6 J 6 K 6 L 6 M 6 N Dissolution rate 6 10 19 38 24 15 27 1.5 hours Dissolution rate 8 17 29 59 39 25 43 2.5 hours Dissolution rate 20 52 73 96 86 62 89   7 hours

Experimental Example 7 Dissolution Test of Modified Release Formulation with Coating Membrane

A drug release property from each of the formulations, prepared in Examples 7A to 7E was evaluated by the method described in Experimental Example 1. The results are shown in Table 19 and FIG. 8.

TABLE 19 Examples 7 A 7 B 7 C 7 D 7 E Dissolution rate 1 3 5 5 42 1.5 hours Dissolution rate 2 3 14 7 67 2.5 hours Dissolution rate 8 6 99 54 104 7 hours

Experimental Example 8 Dissolution Test of Matrix Formulation Using Insoluble Polymer

A drug release property from each of the formulations prepared in Examples 8A to 8C was evaluated by the method described in Experimental Example 1. The results are shown in Table 20 and FIG. 9.

TABLE 20 Examples 8 A 8 B 8 C Dissolution rate 12 22 28 1.5 hours Dissolution rate 17 32 42 2.5 hours Dissolution rate 38 69 86 7 hours

A drug release property from each of the formulations prepared in Examples 8D to 8G was evaluated by the method described in Experimental Example 1. The results are shown in Table 21 and FIG. 10.

TABLE 21 Examples 8 D 8 E 8 F 8 G Dissolution rate 51 45 67 66 1.5 hours Dissolution rate 57 50 77 75 2.5 hours Dissolution rate 69 60 92 91 7 hours

Experimental Example 9 Pharmacokinetics (PK) Test of Immediate Release Formulation (Capsule Formulation) in Human

An immediate release formulation (capsule formulation) containing compound A was administered to healthy subjects in a fasted state, before 30 min from the intake of a meal, or after 30 min from the meal, and the drug concentration in the plasma was measured. The immediate release formulations (capsule formulations) containing 0.1 mg, 1 mg, 5 mg, 20 mg, and 80 mg of the compound A were used in combinations as needed so that the dose of compound A became 0.1 mg, 1 mg, 3 mg, 10 mg, 30 mg, 100 mg, 160 mg, 240 mg, and 340 mg.

Results are shown in FIG. 11. When the maximum plasma concentration (Cmax) of compound A and the increase in heart rate from the base line were analyzed, a positive correlation was observed.

Experimental Example 10 Pharmacokinetics (PK) Test of Sustained Release Hydrogel-Forming Formulation in Human

The pharmaceutical composition for modified release of the present invention prepared in Example 1A or 1B (containing compound A in an amount corresponding to 200 mg) was administered to healthy subjects in a fasted state (Fasted) or after 30 min from the intake of a meal (Fed), and the drug concentration in the plasma was measured. On the other hand, two capsules of the pharmaceutical composition (conventional formulation) (containing compound A in an amount corresponding to 160 mg) of Comparative Example 1 was administered to healthy subjects in a fasted state or after 30 min from the intake of a meal, and the drug concentration in the plasma was measured.

The results in the pharmaceutical composition for modified release of the present invention prepared in Example 1A are shown in FIG. 12, and the results in the pharmaceutical composition for modified release of the present invention prepared in Example 1B are shown in FIG. 13, respectively.

With respect to the conventional formulation, the rate of decrease of Cmax in the fed state was 67%, in comparison with that in the fasted state, and the rate of decrease of AUC was 47% (Cmax in the fasted state was approximately three times higher than that in the fed state). With respect to the pharmaceutical compositions for modified release (1A and 1B) of the present invention, the rates of decrease of Cmax in the fed state were 4% and 10%, in comparison with those in the fasted state, and the rates of decrease of AUC were 10% and −4%. These results indicated that the reductions of Cmax and AUC caused by food intake could be significantly alleviated by the pharmaceutical composition for modified release of the present invention.

Furthermore, the maximum plasma concentration after the administration of the pharmaceutical composition for modified release prepared in Example 1A of the present invention was 274 ng/mL and 264 ng/mL in the fasted state and in the fed state, respectively. Similarly, in Example 1B, they were 155 ng/mL and 140 ng/mL, respectively. Furthermore, the increase in heart rate is 13 bpm or less in both.

INDUSTRIAL APPLICABILITY

According to the present invention, a pharmaceutical composition for modified release which is not affected by the effects of food intake and exhibits a decreased change in AUC or Cmax by controlling the releasing rate of the active ingredient can be provided.

As above, the present invention was explained with reference to particular embodiments, but modifications and improvements obvious to those skilled in the art are included in the scope of the present invention. 

1. A pharmaceutical composition for modified release comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy=2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, and a carrier for a sustained release pharmaceutical composition, wherein a dissolution rate of the drug from the composition is less than 85% after 30 minutes from the beginning of a dissolution test.
 2. The pharmaceutical composition for modified release according to claim 1, wherein a dissolution rate is 75% or less after 1.5 hours from the beginning of the dissolution test.
 3. The pharmaceutical composition for modified release according to claim 1, wherein the dissolution rate is 75% or less after 1.5 hours from the beginning the dissolution test, and a dissolution rate is 75% to 100% after 7 hours from the beginning of the dissolution test.
 4. The pharmaceutical composition for modified release according to claim 1, which is selected from the group consisting of a sustained release hydrogel-forming formulation, a multi-layered formulation consisting of a drug core and a release-controlling layer which are geometrically arranged, a gel formulation in which a plurality of gums is combined, an osmotic pump type formulation, a formulation utilizing a swelling polymer, a matrix formulation utilizing a water-soluble polymer, a modified release formulation with a coating membrane, and a matrix formulation utilizing an insoluble polymer.
 5. A method of reducing an effect of food intake, comprising the step of administering a pharmaceutical composition comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, and a carrier for a sustained release pharmaceutical composition, wherein a dissolution rate of the drug from the composition is less than 85% after 30 minutes from the beginning of a dissolution test.
 6. The method of reducing an effect of food intake according to claim 5, wherein a dissolution rate is 75% or less after 1.5 hours from the beginning of the dissolution test.
 7. The method of reducing an effect of food intake according to claim 5, wherein the dissolution rate is 75% or less after 1.5 hours from the beginning the dissolution test, and a dissolution rate is 75% to 100% after 7 hours from the beginning of the dissolution test.
 8. The method of reducing an effect of food intake according to claim 5, wherein the pharmaceutical composition is selected from the group consisting of a sustained release hydrogel-forming formulation, a multi-layered formulation consisting of a drug core and a release-controlling layer which are geometrically arranged, a gel formulation in which a plurality of gums is combined, an osmotic pump type formulation, a formulation utilizing a swelling polymer, a matrix formulation utilizing a water-soluble polymer, a modified release formulation with a coating membrane, and a matrix formulation utilizing an insoluble polymer. 